Citation:

PANGAEA.986132

Name: RS15-LC62 Diatom counts and biogenic silica from Moubray Bay, northwest Ross Sea, Antarctica
Published: 2025-10-27
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Antarctic; biogenic silica; Diatoms; Ross Sea; sediment

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Published: 2025-10-27 • DOI 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:

Australian Institute of Nuclear Science and Engineering, grant/award no. ALNSTU11923

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: * 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):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m	Gilmer, Greer		Geocode – Composite depth top (m below sea floor)
2	Sediment type	Sediment		Gilmer, Greer		Description of sediment
3	Sample mass	Samp m	mg	Gilmer, Greer
4	Magnification	Mag	X	Gilmer, Greer	Light microscope, Olympus, BH-2	630x magnification
5	Fields	Fields	#	Gilmer, Greer	Light microscope, Olympus, BH-2	Fields of view
6	Total counts	Total counts	#	Gilmer, Greer	Light microscope, Olympus, BH-2
7	Actinocyclus actinochilus	A. actinochilus	#	Gilmer, Greer	Light microscope, Olympus, BH-2
8	Asteromphalus hookeri	A. hookeri	#	Gilmer, Greer	Light microscope, Olympus, BH-2
9	Actinocyclus curvatulus	A. curvatulus	#	Gilmer, Greer	Light microscope, Olympus, BH-2
10	Asteromphalus parvulus	A. parvulus	#	Gilmer, Greer	Light microscope, Olympus, BH-2
11	Chaetoceros bulbosus	C. bulbosus	#	Gilmer, Greer	Light microscope, Olympus, BH-2
12	Chaetoceros criophilus	C. criophilus	#	Gilmer, Greer	Light microscope, Olympus, BH-2
13	Chaetoceros dichaeta	C. dichaeta	#/l	Gilmer, Greer	Light microscope, Olympus, BH-2
14	Chaetoceros spp.	Chaetoceros spp.	#	Gilmer, Greer	Light microscope, Olympus, BH-2
15	Chaetoceros spp., resting spores	Chaetoceros spp. rs	#	Gilmer, Greer	Light microscope, Olympus, BH-2
16	Chaetoceros spp. vegetative cells	Chaetoceros spp. veg	#	Gilmer, Greer	Light microscope, Olympus, BH-2
17	Corethron pennatum	C. pennatum	#	Gilmer, Greer	Light microscope, Olympus, BH-2
18	Coscinodiscus spp.	Coscinodiscus spp.	#	Gilmer, Greer	Light microscope, Olympus, BH-2
19	Eucampia spp.	Eucampia spp.	#	Gilmer, Greer	Light microscope, Olympus, BH-2
20	Eucampia antarctica	E. antarctica	#	Gilmer, Greer	Light microscope, Olympus, BH-2	resting intercalary, flat
21	Eucampia antarctica	E. antarctica	#	Gilmer, Greer	Light microscope, Olympus, BH-2	resting terminal, pointy
22	Eucampia antarctica	E. antarctica	#	Gilmer, Greer	Light microscope, Olympus, BH-2	spp.
23	Eucampia antarctica var. recta	E. antarctica var. recta	#	Gilmer, Greer	Light microscope, Olympus, BH-2
24	Fragilariopsis curta	F. curta	#	Gilmer, Greer	Light microscope, Olympus, BH-2
25	Fragilariopsis cylindrus	F. cylindrus	#	Gilmer, Greer	Light microscope, Olympus, BH-2
26	Fragilariopsis kerguelensis	F. kerguelensis	#	Gilmer, Greer	Light microscope, Olympus, BH-2
27	Fragilariopsis obliquecostata	F. obliquecostata	#	Gilmer, Greer	Light microscope, Olympus, BH-2
28	Fragilariopsis rhombica	F. rhombica	#	Gilmer, Greer	Light microscope, Olympus, BH-2
29	Fragilariopsis ritscheri	F. ritscheri	#	Gilmer, Greer	Light microscope, Olympus, BH-2
30	Fragilariopsis spp.	Fragilariopsis spp.	#	Gilmer, Greer	Light microscope, Olympus, BH-2
31	Fragilariopsis sublinearis	F. sublinearis	#	Gilmer, Greer	Light microscope, Olympus, BH-2
32	Fragilariopsis vanheurckii	F. vanheurckii	#	Gilmer, Greer	Light microscope, Olympus, BH-2
33	Navicula spp.	Navicula spp.	#	Gilmer, Greer	Light microscope, Olympus, BH-2
34	Nitzschia spp.	Nitzschia spp.	#	Gilmer, Greer	Light microscope, Olympus, BH-2
35	Odontella weissflogii	O. weissflogii	#	Gilmer, Greer	Light microscope, Olympus, BH-2
36	Porosira glacialis	P. glacialis	#	Gilmer, Greer	Light microscope, Olympus, BH-2
37	Proboscia alata	P. alata	#	Gilmer, Greer	Light microscope, Olympus, BH-2
38	Proboscia inermis	P. inermis	#	Gilmer, Greer	Light microscope, Olympus, BH-2
39	Proboscia spp.	Proboscia spp.	#	Gilmer, Greer	Light microscope, Olympus, BH-2
40	Proboscia truncata	P. truncata	#	Gilmer, Greer	Light microscope, Olympus, BH-2
41	Pseudo-nitzschia spp.	Pseudo-nitzschia spp.	#	Gilmer, Greer	Light microscope, Olympus, BH-2	thin types
42	Rhizosolenia spp.	Rhizosolenia spp.	#	Gilmer, Greer	Light microscope, Olympus, BH-2
43	Shionodiscus gracilis var. expectus	S. gracilis var. expectus	#	Gilmer, Greer	Light microscope, Olympus, BH-2
44	Shionodiscus gracilis var. gracilis	S. gracilis var. gracilis	#	Gilmer, Greer	Light microscope, Olympus, BH-2
45	Shionodiscus gracilis	S. gracilis	#	Gilmer, Greer	Light microscope, Olympus, BH-2
46	Shionodiscus spp.	Shionodiscus spp.	#	Gilmer, Greer	Light microscope, Olympus, BH-2
47	Dictyocha speculum	D. speculum	#	Gilmer, Greer	Light microscope, Olympus, BH-2
48	Silicoflagellate indeterminata	Silicoflagellate indet	#	Gilmer, Greer	Light microscope, Olympus, BH-2
49	Stellarima microtrias	S: microtrias	#	Gilmer, Greer	Light microscope, Olympus, BH-2
50	Thalassionema spp.	Thalassionema spp.	#	Gilmer, Greer	Light microscope, Olympus, BH-2
51	Thalassiosira antarctica	T. antarctica	#	Gilmer, Greer	Light microscope, Olympus, BH-2
52	Thalassiosira frenguelliopsis	T. frenguelliopsis	#	Gilmer, Greer	Light microscope, Olympus, BH-2
53	Thalassiosira lentiginosa	T. lentiginosa	#	Gilmer, Greer	Light microscope, Olympus, BH-2
54	Thalassiosira oliverana	T. oliverana	#	Gilmer, Greer	Light microscope, Olympus, BH-2
55	Thalassiosira poroseriata	T. poroseriata	#	Gilmer, Greer	Light microscope, Olympus, BH-2
56	Thalassiosira spp.	Thalassiosira spp.	#	Gilmer, Greer	Light microscope, Olympus, BH-2
57	Thalassiosira tumida	T. tumida	#	Gilmer, Greer	Light microscope, Olympus, BH-2
58	Trichotoxon reinboldii	T. reinboldii	#	Gilmer, Greer	Light microscope, Olympus, BH-2
59	Diatoms, other	Diatom oth	#	Gilmer, Greer	Light microscope, Olympus, BH-2
60	Chaetoceros spp., resting spores	Chaetoceros spp. rs	%	Gilmer, Greer	Light microscope, Olympus, BH-2	Relative abundance
61	Corethron pennatum	C. pennatum	%	Gilmer, Greer	Light microscope, Olympus, BH-2	Relative abundance
62	Fragilariopsis curta	F. curta	%	Gilmer, Greer	Light microscope, Olympus, BH-2	Relative abundance
63	Diatoms abundance, including resting stage, per unit sediment dry mass	Diatom abund i rs	10⁸ #/g	Gilmer, Greer	Light microscope, Olympus, BH-2	Absolute diatom abundance
64	Biogenic silica	bSiO2	%	Gilmer, Greer		weight percent

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

4293 data points

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