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Raposeiro, Pedro Miguel; Hernández, Armand; Gonçalves, Vítor; Bao, Roberto; Sáez, Alberto; Shanahan, Timothy M; Rúbio, Maria Jesus; Vázquez-Loureiro, David; Giralt, Santiago (2021): Multi-proxy analysis of sediment cores from Lake Azul (Azores archipelago, Portugal). PANGAEA, https://doi.org/10.1594/PANGAEA.933710

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Abstract:
The Azores archipelago is a group of nine oceanic volcanic islands located in the mid-North Atlantic, roughly 1500 km from Europe and 1900 km from America. Lake Azul located in São Miguel island has a surface area of 4.35 km, 28m of maximum depth and is located at 259m above sea level. A coring campaign was conducted in September 2011 using a 60mm diameter UWITEC gravity corer from UWITEC floating platform retrieving a Core AZ11_02 (1.70 m long) located in the deep basin of the lake (27m depth). The core was dated using ¹⁴C and produced a multi-proxy dataset of geochemical and biological analyses that we used to uncover paleoenvironmental changes on Lake Azul in the last 660 years.
Keyword(s):
Azores Archipelago; deep lake; multiproxy; oceanic island
Related to:
Raposeiro, Pedro Miguel; Rúbio, Maria Jesus; González, Alba; Hernández, Armand; Sánchez-López, Guiomar; Vázquez-Loureiro, David; Rull, V; Bao, Roberto; Costa, Ana Cristina; Gonçalves, Vítor; Sáez, Alberto; Giralt, Santiago (2017): Impact of the historical introduction of exotic fishes on the chironomid community of Lake Azul (Azores Islands). Palaeogeography, Palaeoclimatology, Palaeoecology, 466, 77-88, https://doi.org/10.1016/j.palaeo.2016.11.015
Vázquez-Loureiro, David; Gonçalves, Vítor; Sáez, Alberto; Hernández, Armand; Raposeiro, Pedro Miguel; Giralt, Santiago; Rubio-Inglés, María J; Rull, V; Bao, Roberto (2019): Diatom-inferred ecological responses of an oceanic lake system to volcanism and anthropogenic perturbations since 1290 CE. Palaeogeography, Palaeoclimatology, Palaeoecology, 534, 109285, https://doi.org/10.1016/j.palaeo.2019.109285
Funding:
Federal Ministry of Food and Agriculture (BMEL), grant/award no. 2813HS009: Development of a CCAMLR Marine Protected Area in the Antarctic Weddell Sea
Coverage:
Latitude: 37.872222 * Longitude: -25.773889
Date/Time Start: 2011-09-11T00:00:00 * Date/Time End: 2011-09-11T00:00:00
Minimum Elevation: 270.0 m * Maximum Elevation: 270.0 m
Event(s):
Azul11 * Latitude: 37.872222 * Longitude: -25.773889 * Date/Time: 2011-09-11T00:00:00 * Elevation: 270.0 m * Recovery: 1.33 m * Location: Lake Azul, Azores * Method/Device: Gravity corer, UWITEC (GCUWI)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
AGEAgeka BPGeocode
AgeAgea AD/CEGiralt, Santiago
Aerophilous diatomsAeroph diatom%Bao, RobertoDiatom analysis (Battarbee, 1986, in Berglund, Handbook of Holocene Pal.)
Diatoms, benthicDiatom benthic%Bao, RobertoDiatom analysis (Battarbee, 1986, in Berglund, Handbook of Holocene Pal.)
Carbon dioxide, partial pressure, blood, standard errorpCO2 blood std e±Bao, RobertoDiatom analysis (Battarbee, 1986, in Berglund, Handbook of Holocene Pal.)
Diatoms, plankticDiatom plank%Bao, RobertoDiatom analysis (Battarbee, 1986, in Berglund, Handbook of Holocene Pal.)
ChironominiChironomini%Raposeiro, Pedro MiguelChironomid analysis (Brooks et al, 2007, The identification and use of Palaeartic Chironomid Larvae in Palaecology)Chironomidae Chironomini
OrthocladiinaeOrthocladiinae%Raposeiro, Pedro MiguelChironomid analysis (Brooks et al, 2007, The identification and use of Palaeartic Chironomid Larvae in Palaecology)Chironomidae Orthocladiinae
TanytarsiniTanytarsini%Raposeiro, Pedro MiguelChironomid analysis (Brooks et al, 2007, The identification and use of Palaeartic Chironomid Larvae in Palaecology)Chironomidae Tanytarsini
10 TanypodinaeTanypodinae%Raposeiro, Pedro MiguelChironomid analysis (Brooks et al, 2007, The identification and use of Palaeartic Chironomid Larvae in Palaecology)
11 Carbon, organic, total/Nitrogen, total ratioTOC/TNGiralt, Santiago
12 Carbon, organic, totalTOC%Giralt, SantiagoMass spectrometer Finnigan Finnigan delta Plus EA-CF-IRMS
13 δ13Cδ13C‰ PDBGiralt, SantiagoMass spectrometer Finnigan Finnigan delta Plus EA-CF-IRMS
14 Nitrogen, totalTN%Giralt, SantiagoMass spectrometer Finnigan Finnigan delta Plus EA-CF-IRMS
15 δ15Nδ15N‰ airGiralt, SantiagoMass spectrometer Finnigan Finnigan delta Plus EA-CF-IRMS
16 Accumulation rate, 5beta-cholestan-3beta-olAcc rate coprostanolng/cm2/aShanahan, Timothy MGas chromatography - Mass spectrometry (GC-MS)Coprostanol flux
17 Accumulation rate, 5alpha-stigmastan-3beta-olAcc rate stigmastanolng/cm2/aShanahan, Timothy MGas chromatography - Mass spectrometry (GC-MS)Stigmastanol flux
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1471 data points

Data

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


Age [ka BP]

Age [a AD/CE]

Aeroph diatom [%]

Diatom benthic [%]

pCO2 blood std e [±]

Diatom plank [%]

Chironomini [%]

Orthocladiinae [%]

Tanytarsini [%]
10 
Tanypodinae [%]
11 
TOC/TN
12 
TOC [%]
13 
δ13C [‰ PDB]
14 
TN [%]
15 
δ15N [‰ air]
16 
Acc rate coprostanol [ng/cm2/a]
17 
Acc rate stigmastanol [ng/cm2/a]
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0.00119493.10.4
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0.00719433.10.4
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0.01719332.90.4
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0.34116093.80.9
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0.37315772.50.5
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0.38915613.90.5
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0.43215180.00.4
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0.44615040.00.3
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0.45914910.00.4
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0.49714534.31.4
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0.56613844.51.2
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0.57913717.685.42.74.34.20.075.020.89.70.7-25.10.11.74.40.5
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0.62413265.20.7
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0.654129624.658.71.715.03.13.190.63.17.80.5-24.00.12.7
0.655129514.674.90.510.07.70.7-23.10.12.2
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0.657129316.777.20.65.58.10.6-25.70.11.8
0.658129219.172.41.57.07.40.4-25.90.12.83.61.2
0.659129140.854.00.84.410.00.5-25.80.13.1
0.660129036.523.70.039.89.60.7-26.50.12.2
0.661128936.221.60.242.08.90.7-25.60.11.6
0.662128853.234.90.711.27.70.5-24.60.12.13.74.3
0.66312870.00.4
0.66812820.01.0