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Gilmer, Greer; Riesselman, Christina R; Kim, Sunghan (2025): RS15-LC62 Diatom counts and biogenic silica from Moubray Bay, northwest Ross Sea, Antarctica [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.986132

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Published: 2025-10-27DOI registered: 2025-11-04

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Abstract:
A high-resolution record of diatom counts and biogenic silica in sediment core RS15-LC62 collected from Moubray Bay, northwest Ross Sea, Antarctica by Korea Polar Research Institute (KOPRI) expedition ANA05B in 2015. Core is 4.8 m long. Sediment samples were collected from lamination pairs or triplets in the upper ~2.3 m of the core and then as 1 cm thick sediment samples below 2.3 m due to textural differences in the core. Data includes diatom census counts, relative diatom abundance (RDA) of the three most dominant taxa downcore, absolute diatom abundance (ADA), and wt% biogenic silica. Data was used to reconstruct changes in environmental conditions such as sea ice concentration and water column structure over ~500 years during the early Holocene.
Keyword(s):
Antarctic; biogenic silica; Diatoms; Ross Sea; sediment
Supplement to:
Gilmer, Greer; Riesselman, Christina R; Kim, Sunghan; Yoo, Kyu-Cheul; Lee, Jae Il; Lee, Min Kyung; Ginnane, Catherine E; Rosenheim, Brad; Turnbull, J; Parker, Rebecca L; Jacobsen, Geraldine; McKay, Robert M; Levy, Richard H; Moy, Christopher M (accepted): Increased sea ice duration in Moubray Bay, northwest Ross Sea linked to early Holocene wind strength. Paleoceanography and Paleoclimatology
Funding:
Korea Polar Research Institute (KOPRI), grant/award no. PE25090
Ministry of Business, Innovation and Employment (MBIE), grant/award no. ANTA1801
Ministry of Business, Innovation and Employment (MBIE), grant/award no. C05X1001
Coverage:
Latitude: -72.075692 * Longitude: 170.456007
Date/Time Start: 2015-01-30T00:00:00 * Date/Time End: 2015-01-30T00:00:00
Minimum DEPTH, sediment/rock: 0.080 m * Maximum DEPTH, sediment/rock: 4.810 m
Event(s):
RS15-LC62 * Latitude: -72.075692 * Longitude: 170.456007 * Date/Time: 2015-01-30T00:00:00 * Elevation: -594.0 m * Recovery: 4.8 m * Location: Ross Sea * Campaign: ANA05B * Basis: Araon * Method/Device: Jumbo Piston Core (JPC) * Comment: Jumbo piston corer deployed in gravity mode
Comment:
Supported by the L'Oréal-UNESCO For Women in Science Australia and New Zealand Fellowship
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
DEPTH, sediment/rockDepth sedmGilmer, GreerGeocode – Composite depth top (m below sea floor)
Sediment typeSedimentGilmer, GreerDescription of sediment
Sample massSamp mmgGilmer, Greer
MagnificationMagXGilmer, GreerLight microscope, Olympus, BH-2630x magnification
FieldsFields#Gilmer, GreerLight microscope, Olympus, BH-2Fields of view
Total countsTotal counts#Gilmer, GreerLight microscope, Olympus, BH-2
Actinocyclus actinochilusA. actinochilus#Gilmer, GreerLight microscope, Olympus, BH-2
Asteromphalus hookeriA. hookeri#Gilmer, GreerLight microscope, Olympus, BH-2
Actinocyclus curvatulusA. curvatulus#Gilmer, GreerLight microscope, Olympus, BH-2
10 Asteromphalus parvulusA. parvulus#Gilmer, GreerLight microscope, Olympus, BH-2
11 Chaetoceros bulbosusC. bulbosus#Gilmer, GreerLight microscope, Olympus, BH-2
12 Chaetoceros criophilusC. criophilus#Gilmer, GreerLight microscope, Olympus, BH-2
13 Chaetoceros dichaetaC. dichaeta#/lGilmer, GreerLight microscope, Olympus, BH-2
14 Chaetoceros spp.Chaetoceros spp.#Gilmer, GreerLight microscope, Olympus, BH-2
15 Chaetoceros spp., resting sporesChaetoceros spp. rs#Gilmer, GreerLight microscope, Olympus, BH-2
16 Chaetoceros spp. vegetative cellsChaetoceros spp. veg#Gilmer, GreerLight microscope, Olympus, BH-2
17 Corethron pennatumC. pennatum#Gilmer, GreerLight microscope, Olympus, BH-2
18 Coscinodiscus spp.Coscinodiscus spp.#Gilmer, GreerLight microscope, Olympus, BH-2
19 Eucampia spp.Eucampia spp.#Gilmer, GreerLight microscope, Olympus, BH-2
20 Eucampia antarcticaE. antarctica#Gilmer, GreerLight microscope, Olympus, BH-2resting intercalary, flat
21 Eucampia antarcticaE. antarctica#Gilmer, GreerLight microscope, Olympus, BH-2resting terminal, pointy
22 Eucampia antarcticaE. antarctica#Gilmer, GreerLight microscope, Olympus, BH-2spp.
23 Eucampia antarctica var. rectaE. antarctica var. recta#Gilmer, GreerLight microscope, Olympus, BH-2
24 Fragilariopsis curtaF. curta#Gilmer, GreerLight microscope, Olympus, BH-2
25 Fragilariopsis cylindrusF. cylindrus#Gilmer, GreerLight microscope, Olympus, BH-2
26 Fragilariopsis kerguelensisF. kerguelensis#Gilmer, GreerLight microscope, Olympus, BH-2
27 Fragilariopsis obliquecostataF. obliquecostata#Gilmer, GreerLight microscope, Olympus, BH-2
28 Fragilariopsis rhombicaF. rhombica#Gilmer, GreerLight microscope, Olympus, BH-2
29 Fragilariopsis ritscheriF. ritscheri#Gilmer, GreerLight microscope, Olympus, BH-2
30 Fragilariopsis spp.Fragilariopsis spp.#Gilmer, GreerLight microscope, Olympus, BH-2
31 Fragilariopsis sublinearisF. sublinearis#Gilmer, GreerLight microscope, Olympus, BH-2
32 Fragilariopsis vanheurckiiF. vanheurckii#Gilmer, GreerLight microscope, Olympus, BH-2
33 Navicula spp.Navicula spp.#Gilmer, GreerLight microscope, Olympus, BH-2
34 Nitzschia spp.Nitzschia spp.#Gilmer, GreerLight microscope, Olympus, BH-2
35 Odontella weissflogiiO. weissflogii#Gilmer, GreerLight microscope, Olympus, BH-2
36 Porosira glacialisP. glacialis#Gilmer, GreerLight microscope, Olympus, BH-2
37 Proboscia alataP. alata#Gilmer, GreerLight microscope, Olympus, BH-2
38 Proboscia inermisP. inermis#Gilmer, GreerLight microscope, Olympus, BH-2
39 Proboscia spp.Proboscia spp.#Gilmer, GreerLight microscope, Olympus, BH-2
40 Proboscia truncataP. truncata#Gilmer, GreerLight microscope, Olympus, BH-2
41 Pseudo-nitzschia spp.Pseudo-nitzschia spp.#Gilmer, GreerLight microscope, Olympus, BH-2thin types
42 Rhizosolenia spp.Rhizosolenia spp.#Gilmer, GreerLight microscope, Olympus, BH-2
43 Shionodiscus gracilis var. expectusS. gracilis var. expectus#Gilmer, GreerLight microscope, Olympus, BH-2
44 Shionodiscus gracilis var. gracilisS. gracilis var. gracilis#Gilmer, GreerLight microscope, Olympus, BH-2
45 Shionodiscus gracilisS. gracilis#Gilmer, GreerLight microscope, Olympus, BH-2
46 Shionodiscus spp.Shionodiscus spp.#Gilmer, GreerLight microscope, Olympus, BH-2
47 Dictyocha speculumD. speculum#Gilmer, GreerLight microscope, Olympus, BH-2
48 Silicoflagellate indeterminataSilicoflagellate indet#Gilmer, GreerLight microscope, Olympus, BH-2
49 Stellarima microtriasS: microtrias#Gilmer, GreerLight microscope, Olympus, BH-2
50 Thalassionema spp.Thalassionema spp.#Gilmer, GreerLight microscope, Olympus, BH-2
51 Thalassiosira antarcticaT. antarctica#Gilmer, GreerLight microscope, Olympus, BH-2
52 Thalassiosira frenguelliopsisT. frenguelliopsis#Gilmer, GreerLight microscope, Olympus, BH-2
53 Thalassiosira lentiginosaT. lentiginosa#Gilmer, GreerLight microscope, Olympus, BH-2
54 Thalassiosira oliveranaT. oliverana#Gilmer, GreerLight microscope, Olympus, BH-2
55 Thalassiosira poroseriataT. poroseriata#Gilmer, GreerLight microscope, Olympus, BH-2
56 Thalassiosira spp.Thalassiosira spp.#Gilmer, GreerLight microscope, Olympus, BH-2
57 Thalassiosira tumidaT. tumida#Gilmer, GreerLight microscope, Olympus, BH-2
58 Trichotoxon reinboldiiT. reinboldii#Gilmer, GreerLight microscope, Olympus, BH-2
59 Diatoms, otherDiatom oth#Gilmer, GreerLight microscope, Olympus, BH-2
60 Chaetoceros spp., resting sporesChaetoceros spp. rs%Gilmer, GreerLight microscope, Olympus, BH-2Relative abundance
61 Corethron pennatumC. pennatum%Gilmer, GreerLight microscope, Olympus, BH-2Relative abundance
62 Fragilariopsis curtaF. curta%Gilmer, GreerLight microscope, Olympus, BH-2Relative abundance
63 Diatoms abundance, including resting stage, per unit sediment dry massDiatom abund i rs108 #/gGilmer, GreerLight microscope, Olympus, BH-2Absolute diatom abundance
64 Biogenic silicabSiO2%Gilmer, Greerweight percent
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
4293 data points

Data

Download dataset as tab-delimited text — use the following character encoding:


Depth sed [m]
(Composite depth top (m below ...)

Sediment
(Description of sediment)

Samp m [mg]

Mag [X]
(630x magnification)

Fields [#]
(Fields of view)

Total counts [#]

A. actinochilus [#]

A. hookeri [#]

A. curvatulus [#]
10 
A. parvulus [#]
11 
C. bulbosus [#]
12 
C. criophilus [#]
13 
C. dichaeta [#/l]
14 
Chaetoceros spp. [#]
15 
Chaetoceros spp. rs [#]
16 
Chaetoceros spp. veg [#]
17 
C. pennatum [#]
18 
Coscinodiscus spp. [#]
19 
Eucampia spp. [#]
20 
E. antarctica [#]
(resting intercalary, flat)
21 
E. antarctica [#]
(resting terminal, pointy)
22 
E. antarctica [#]
(spp.)
23 
E. antarctica var. recta [#]
24 
F. curta [#]
25 
F. cylindrus [#]
26 
F. kerguelensis [#]
27 
F. obliquecostata [#]
28 
F. rhombica [#]
29 
F. ritscheri [#]
30 
Fragilariopsis spp. [#]
31 
F. sublinearis [#]
32 
F. vanheurckii [#]
33 
Navicula spp. [#]
34 
Nitzschia spp. [#]
35 
O. weissflogii [#]
36 
P. glacialis [#]
37 
P. alata [#]
38 
P. inermis [#]
39 
Proboscia spp. [#]
40 
P. truncata [#]
41 
Pseudo-nitzschia spp. [#]
(thin types)
42 
Rhizosolenia spp. [#]
43 
S. gracilis var. expectus [#]
44 
S. gracilis var. gracilis [#]
45 
S. gracilis [#]
46 
Shionodiscus spp. [#]
47 
D. speculum [#]
48 
Silicoflagellate indet [#]
49 
S: microtrias [#]
50 
Thalassionema spp. [#]
51 
T. antarctica [#]
52 
T. frenguelliopsis [#]
53 
T. lentiginosa [#]
54 
T. oliverana [#]
55 
T. poroseriata [#]
56 
Thalassiosira spp. [#]
57 
T. tumida [#]
58 
T. reinboldii [#]
59 
Diatom oth [#]
60 
Chaetoceros spp. rs [%]
(Relative abundance)
61 
C. pennatum [%]
(Relative abundance)
62 
F. curta [%]
(Relative abundance)
63 
Diatom abund i rs [108 #/g]
(Absolute diatom abundance)
64 
bSiO2 [%]
(weight percent)
0.080Dark7.151630128348516119119512648173511113516213212014.6634.2027.302.1541.68
0.090Light7.0736301282984644456541219912822172174245913114.7721.8133.221.8639.30
0.170Dark7.55863015034411377109857733826116712121516221214128.4922.3823.841.7242.90
0.185Light7.5606302504421158511962217932165113481311111415121115021.7240.5014.711.3240.98
0.245Dark7.730630144537211221371953111889361232124122351113355528331125.519.8735.012.7339.88
0.260Light7.59063019240612276294113513116541521131106.6572.418.621.5839.41
0.340Dark8.006630129510233808941327733112810113252721111215.6917.4554.312.7943.20
0.355Light7.977630150350147541310106816243212242021.4337.4330.291.6642.32
0.390Dark8.1836302163571432644477322135649131015214922155101315217.9313.1737.821.1445.90
0.400Light7.94363025034211416448639225717212262261201434107174112112214.0418.4220.760.9751.64
0.475Dark8.12763010043361321310431112111094523916662134378416124.0225.6425.173.0141.97
0.490Light7.96463011235811616209063721364154132415304.4758.3817.602.2741.58
0.565Dark8.1256301444932112011568111383531315841111221123111111040.7713.7927.992.3839.20
0.570Light8.2696301504591211666142118610241064114141231111236.1730.9418.742.0939.94
0.635Dark7.98363012958221273480345155567313311426221512021.828.2559.283.2041.50
0.670Light7.95463012942112762871138113251111111018.0568.179.032.3240.95
0.715Dark8.02263094571117916532113476551713211118210323111313.849.2860.774.2943.75
0.730Light8.130630934949246259721124611211614311831132319.3119.6449.803.7044.65
0.795Dark8.7996301514242312865532113362323972113114152261030.1912.9731.371.8145.43
0.800Light/Orange7.49163090536311071897021845918871423610111253019.9618.1040.674.5048.56
0.870Dark8.1056301144511314931928018841524271261113256111231020.626.2141.692.7644.53
0.885Light7.946630114438211433714511180447152151153822158.4533.1141.102.7438.29
0.970Massive8.01963068514731603660107314969252416111171861135131.1311.6728.995.3344.50
1.065Dark8.0026301145072131051943222254810112652113311241681313120.718.4844.383.1544.71
1.080Light8.21763076466233328143024341565332532106.8730.6952.154.2243.31
1.120Olive8.0356301294631232251045326321135311662112050.1122.4613.612.5342.18
1.135Orange8.0146301336992143045119116437431126174111121161.5217.029.163.7137.56
1.160White/Orange8.03463015451419859130078317101115382325114238.5225.2915.182.3544.65
1.230Dark8.198630644132111832111997449548212111134541326.887.7548.184.4544.23
1.255Light7.98363076399232222401184113121211553108.0260.1521.053.7246.23
1.310Dark7.993630626311131255612521117111538891479413743140.413.9627.107.2144.63
1.320Light9.97863050504215263166121052111021363777129211713111232.9420.8320.245.7245.01
1.385Dark7.8626307051712514931792723554112620144111416281332028.823.2945.455.3240.55
1.400Light7.070630100418439491171611199621573313331311027.9914.5923.683.3534.52
1.460Dark7.86263015054241814252349111383282091211101323213151346.499.0425.462.6044.01
1.480Orange7.77463015043111021745900784131212411411112234332040.3720.8818.102.0944.21
1.490Light fluffy8.064630200470222429841180124812342834743051.4917.8717.021.6545.48
1.540Dark80.970630865351152128311122891416139411177142112039.630.0042.620.4341.63
1.560Light7.970630164529111149156851172282424231151213111141128.1716.0713.612.2947.19
1.625Dark7.4696307855111981094601142519116131214235811222235.938.3520.695.3542.68
1.635Light7.85163010039511227820118117311210614302924372112119.7529.8718.482.8542.79
1.680Dark7.6736301005112153190724111565296299322133325383211511037.184.7030.533.7745.32
1.690Light7.6406301004162141612912601562114321127192111114.6630.2937.503.0846.62
1.760Mixed7.75763013334965932111132133267135139224411121026.650.0037.821.9141.68
1.820Mixed7.67563050587218129817717431209271721341441131129115513212030.152.9035.608.6642.90
1.880Dark7.543630150498312204336731111072821117931713811525111140.9613.4521.492.4944.66
1.895Orange7.67663010040324231107166227516548313251027.3041.1918.612.9750.51
1.905Fluffy7.7476301504222125101111841184245631233251023.9343.6019.912.0639.98
1.970Dark7.82063010051132152511311487531114511515278422411910199444115125.6417.0328.383.7044.11
1.980Orange8.05863010055911421742517401799377191131422153186212013.2431.1332.023.9344.22
2.050Massive7.599630116671411425415756211791129229831111281210111342151211037.858.3511.774.3146.15
2.110Olive fluffy7.8466301526801123892412122687571284212542653545157.2117.7910.003.2345.31
2.130Orange7.748630114528254286131420262261253113336111221154.1726.894.923.3848.02
2.190Mixed7.901630100761212112224521368242212623313231272101222447112159.408.9416.565.4547.02
2.245Dark8.11363010057412862531220621031062222351633314049.834.3635.894.0043.55
2.265Orange8.023630150612398131114927253112336122165.0321.418.012.8844.80
2.330Dark7.67663010055331321948731128922519195312112572211226358.058.6816.094.0845.56
2.340Light7.7256301005541326178101939531974671243312331311512032.1334.8417.514.0649.60
2.420Mixed7.94063015037118138238232158555854361347111331137.2022.1015.631.7639.78
2.470Dark7.67963090512193105531802289243148798222224552020.5135.1617.384.1942.23
2.485Light7.74063011852711297730422745375813130121121018.4157.6914.043.2743.64
2.530Mixed7.568630100407531481344523122237181117835611531036.3610.8129.983.0446.52
2.580Mixed7.89663015068711103284393611412658108756211555534122347.7413.5418.343.2843.86
2.680Mixed8.074630100478121954667211118231210333122791023122240.7914.0224.693.3545.50
2.730Mixed7.814630150561211259147572141166561449741114372310818146.1713.3720.682.7146.60
2.780Mixed7.7656301005962238470615607511613531251116672241264.4311.7410.074.3446.70
2.830Mixed7.7786302251028134171374962115992258431142162751114069.369.345.743.3248.97
2.875Mixed7.641630100455611187559166103143935361212121910333412241.1012.9722.643.3747.39
2.925Mixed7.770630145546134298139974111641810859111323244152112054.5818.1311.722.7448.81
2.970Dark7.8256309847223420825344112121137911144123751232311144.077.2025.643.4848.52
2.990Orange7.77863099793442542969111193362533132151213068.358.7015.015.8349.86
3.025Mixed7.63463015049412014136321901725213211112133641223140.6927.5318.222.4445.22
3.075Mixed7.9436301149921692795355821371011113225423251322111269.765.348.276.2040.44
3.110Dark7.875630200636142385242166641111712638812214592213211160.533.7717.452.2942.47
3.125Orange fluffy7.609630146782250366318322198410236285121522314241222064.328.0612.533.9848.14
3.175Mixed7.4916301725132512046629331263109111104111622516331333039.775.6524.562.2542.54
3.225Mixed7.65863015058221212414911831284671922261113223513211141.4120.2714.432.8737.35
3.275Mixed7.6936301003801287132157521179397664112331213362312334.7419.7420.792.8032.39
3.325Mixed7.9806302004962189152617421702344205122322134224017.9452.6214.111.7645.75
3.375Mixed7.505630150631183481414552337364817121884268111221155.1522.985.863.1750.38
3.425Mixed7.66463014759612221259158858443664377111111111252454143.4614.266.042.9940.01
3.475Mixed7.950630150956125358710568119836392933227613323313461.407.1110.254.5442.72
3.525Mixed7.6406302005362115273165833104585138322332651123221114050.9310.8219.401.9939.72
3.545Dark mixed7.75263020042811271551115423151331213361321263.3211.9212.621.5647.68
3.555Orange fluffy7.90663015066731511115111511142125721121176.6117.242.253.1849.63
3.570Brown Fluffy7.58963020065212480151101111612461155341311173.6216.872.452.4352.61
3.630Dark7.29963014455211861735011457210542112421121412215.5863.418.152.9739.03
3.640Light7.73763015668285555017411331162102012.4681.382.493.2043.02
3.725Mixed7.854630300483144634011614139211213361109.5270.3912.631.1641.46
3.775Mixed7.6236301505274138145582503211842247413112241115027.5147.443.422.6147.48
3.825Mixed7.7816301504041231518166211396541821341111037.3841.099.651.9649.34
3.875Mixed7.76963020045921211001122911541311315411431453511121.7949.8911.761.6746.14
3.925Mixed7.825630194310109111203124231981121121135.1638.7113.551.1654.48
3.975Mixed7.61463015040521313811435311592211421910232521216134.0735.3114.572.0140.33
4.025Mixed7.7076301503881115115611724174431115611131129.6440.2118.561.9042.60
4.075Mixed7.63763020032213898910611636435264102311030.4332.9219.571.1938.98
4.085Dark7.82063020054712702112308343521211246311113049.3622.4915.171.9848.00
4.100Orange7.885630200459119725262311151711231121312021.1357.0811.111.6541.57
4.120Brown7.93863020043210933221224321134321121311112025.2351.169.951.5448.82
4.175Mixed7.8856302003321156761595324514476513281022241020.1847.8913.551.1947.70
4.225Mixed7.7196301815041651825721178422313442241553421012.9050.9915.482.0445.61
4.255Mixed7.90063010041651167135104932171161752516121340.1432.4511.782.9845.73
4.280Mixed7.671630100333124221106392065422394141091945133031.8327.6319.522.4646.34
4.325Mixed7.907630200351121712328822245452653114116420311143035.0423.3612.821.2638.12
4.420Mixed7.700630604764249760383712177384187152121052.3115.977.985.8350.89
4.470Mixed7.7936303504383512112693272221478217412331192111131148.1721.2310.730.9149.29
4.520Mixed7.79163010031522322118712321130221361121212321137.4639.059.522.2952.67
4.570Mixed7.669630150432131183151612112722552152341543114042.3637.276.252.1349.02
4.610Mixed7.792630150506315152671431262225541116975123112029.8452.775.142.4556.30
4.660Mixed7.7386301505301130397581128162116112221057.1710.945.282.5846.73
4.690Dark7.93063015044312095110114642123263124213111147.1824.8310.382.1148.61
4.700Light7.6236302004741121501525811141191021211114031.6554.432.951.7656.47
4.710Orange7.595630250503111271132721113127721331025.2565.012.581.5055.86
4.760Mixed7.7856302503991210381691166221672354313366222211025.8142.3616.541.1652.76
4.810Mixed7.4366309641715111611590592122412134111126.6238.1314.153.3155.70