scholarly journals Widespread natural methane and oil leakage from sub-marine Arctic reservoirs

2022 ◽  
Author(s):  
Pavel Serov ◽  
Rune Mattingsdal ◽  
Monica Winsborrow ◽  
Henry Patton ◽  
Karin Andreassen
Keyword(s):  
Sea Surface ◽  
The Arctic ◽  
Chemical Markers ◽  
Last Deglaciation ◽  
Geological Structures ◽  
Continental Shelves ◽  
Methane Fluxes ◽  
The Last Deglaciation ◽  
Global Carbon ◽  
Natural Hydrocarbon

Abstract Parceling the anthropogenic and natural (geological) sources of fossil methane in the atmosphere remains problematic due to a lack of distinctive chemical markers for their discrimination. In this light, understanding the distribution and contribution of potential geological methane sources is important. We present empirical observations of hitherto undocumented, widespread and extensive methane and oil release from geological reservoirs to the Arctic Ocean. Methane fluxes from >7,000 seeps significantly deplete in seawater, but nevertheless reach the sea surface and may transfer to the air. Oil slick emission spots and gas ebullition are persistent across multi-year observations and correlate to formerly glaciated geological structures, which have experienced km-scale glacial erosion that has left hydrocarbon reservoirs partially uncapped since the last deglaciation ~15,000 years ago. Such persistent, geologically controlled, natural hydrocarbon release may be characteristic of formerly glaciated hydrocarbon-bearing basins which are common across polar continental shelves, and could represent an underestimated source of natural fossil methane within the global carbon cycle.

scholarly journals Northern and southern hemisphere controls on seasonal sea surface temperatures in the Indian Ocean during the last deglaciation

2013 ◽  
Vol 28 (4) ◽  
pp. 619-632 ◽  
Author(s):  
Yiming V. Wang ◽  
Guillaume Leduc ◽  
Marcus Regenberg ◽  
Nils Andersen ◽  
Thomas Larsen ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Southern Hemisphere ◽  
Sea Surface ◽  
Sea Surface Temperatures ◽  
Last Deglaciation ◽  
Surface Temperatures ◽  
The Indian Ocean ◽  
The Last Deglaciation

scholarly journals Sea surface temperatures of the western Arabian Sea during the last deglaciation

2007 ◽  
Vol 22 (2) ◽  
Author(s):  
M. H. Saher ◽  
S. J. A. Jung ◽  
H. Elderfield ◽  
M. J. Greaves ◽  
D. Kroon
Keyword(s):  
Arabian Sea ◽  
Sea Surface ◽  
Sea Surface Temperatures ◽  
Last Deglaciation ◽  
Surface Temperatures ◽  
The Last Deglaciation

scholarly journals Seemingly divergent sea surface temperature proxy records in the central Mediterranean during the last deglaciation

2013 ◽  
Vol 9 (3) ◽  
pp. 1375-1383 ◽  
Author(s):  
M.-A. Sicre ◽  
G. Siani ◽  
D. Genty ◽  
N. Kallel ◽  
L. Essallami
Keyword(s):  
Adriatic Sea ◽  
Planktonic Foraminifera ◽  
Sea Surface ◽  
Last Deglaciation ◽  
Central Mediterranean ◽  
Proxy Record ◽  
Proxy Records ◽  
The Last Deglaciation ◽  
Temperature Proxy ◽  
Two Temperature

Abstract. Sea surface temperatures (SSTs) were reconstructed over the last 25 000 yr using alkenone paleothermometry and planktonic foraminifera assemblages from two cores of the central Mediterranean Sea: the MD04-2797 core (Siculo–Tunisian channel) and the MD90-917 core (South Adriatic Sea). Comparison of the centennial scale structure of the two temperature signals during the last deglaciation period reveals significant differences in timing and amplitude. We suggest that seasonal changes likely account for seemingly proxy record divergences during abrupt transitions from glacial to interglacial climates and for the apparent short duration of the Younger Dryas (YD) depicted by the alkenone time series, a feature that has already been stressed in earlier studies on the Mediterranean deglaciation.

Diachronous evolution of sea surface conditions in the Labrador Sea and Baffin Bay since the last deglaciation

The Holocene ◽  
2015 ◽  
Vol 25 (12) ◽  
pp. 1882-1897 ◽  
Author(s):  
Olivia T Gibb ◽  
Sarah Steinhauer ◽  
Bianca Fréchette ◽  
Anne de Vernal ◽  
Claude Hillaire-Marcel
Keyword(s):  
Sea Surface ◽  
Labrador Sea ◽  
Last Deglaciation ◽  
Surface Conditions ◽  
Baffin Bay ◽  
The Last Deglaciation

scholarly journals Causes and timing of recurring subarctic Pacific hypoxia

2021 ◽  
Vol 7 (23) ◽  
pp. eabg2906
Author(s):  
Karla P. Knudson ◽  
Ana Christina Ravelo ◽  
Ivano W. Aiello ◽  
Christina P. Knudson ◽  
Michelle K. Drake ◽  
...  
Keyword(s):  
Laminated Sediments ◽  
Last Deglaciation ◽  
Glacial Cycles ◽  
Sea Levels ◽  
Subarctic Pacific ◽  
High Productivity ◽  
The Past ◽  
Continental Shelves ◽  
Pacific Studies ◽  
The Last Deglaciation

Several North Pacific studies of the last deglaciation show hypoxia throughout the ocean margins and attribute this phenomenon to the effects of abrupt warming and meltwater inputs. Yet, because of the lack of long records spanning multiple glacial cycles and deglaciation events, it is unclear whether deoxygenation was a regular occurrence of warming events and whether deglaciation and/or other conditions promoted hypoxia throughout time. Here, subarctic Pacific laminated sediments from the past 1.2 million years demonstrate that hypoxic events recurred throughout the Pleistocene as episodes of highly productive phytoplankton growth and were generally associated with interglacial climates, high sea levels, and enhanced nitrate utilization—but not with deglaciations. We suggest that hypoxia was typically stimulated by high productivity from iron fertilization facilitated by redox-remobilized iron from flooded continental shelves.

scholarly journals Abrupt Heinrich Stadial 1 cooling missing in Greenland oxygen isotopes

2021 ◽  
Vol 7 (25) ◽  
pp. eabh1007
Author(s):  
Chengfei He ◽  
Zhengyu Liu ◽  
Bette L. Otto-Bliesner ◽  
Esther C. Brady ◽  
Chenyu Zhu ◽  
...  
Keyword(s):  
Climate Changes ◽  
Ice Core ◽  
Winter Precipitation ◽  
Oxygen Isotopic Composition ◽  
The Arctic ◽  
Last Deglaciation ◽  
Cold Event ◽  
Proxy Records ◽  
Oxygen Isotopic ◽  
The Last Deglaciation

Abrupt climate changes during the last deglaciation have been well preserved in proxy records across the globe. However, one long-standing puzzle is the apparent absence of the onset of the Heinrich Stadial 1 (HS1) cold event around 18 ka in Greenland ice core oxygen isotope δ18O records, inconsistent with other proxies. Here, combining proxy records with an isotope-enabled transient deglacial simulation, we propose that a substantial HS1 cooling onset did indeed occur over the Arctic in winter. However, this cooling signal in the depleted oxygen isotopic composition is completely compensated by the enrichment because of the loss of winter precipitation in response to sea ice expansion associated with AMOC slowdown during extreme glacial climate. In contrast, the Arctic summer warmed during HS1 and YD because of increased insolation and greenhouse gases, consistent with snowline reconstructions. Our work suggests that Greenland δ18O may substantially underestimate temperature variability during cold glacial conditions.

scholarly journals Tracking nutrient and productivity variations over the Last Deglaciation in the Arctic Ocean

2001 ◽  
Vol 16 (2) ◽  
pp. 199-211 ◽  
Author(s):  
Carsten J. Schubert ◽  
Ruediger Stein ◽  
Stephen E. Calvert
Keyword(s):  
Arctic Ocean ◽  
The Arctic ◽  
Last Deglaciation ◽  
The Arctic Ocean ◽  
The Last Deglaciation

Palynological evidence of Holocene climate change in the eastern Arctic: a possible shift in the Arctic oscillation at the millennial time scaleThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network.

2008 ◽  
Vol 45 (11) ◽  
pp. 1363-1375 ◽  
Author(s):  
David Ledu ◽  
André Rochon ◽  
Anne de Vernal ◽  
Guillaume St-Onge
Keyword(s):  
Arctic Ocean ◽  
Arctic Oscillation ◽  
North Atlantic Ocean ◽  
Sediment Cores ◽  
Sea Surface ◽  
The Arctic ◽  
Last Deglaciation ◽  
Holocene Climate ◽  
The North ◽  
The Arctic Oscillation

Dinocyst assemblages and the physical properties of two sediment cores collected in the easternmost part of the main axis of the Northwest Passage, Canadian Arctic Ocean (cores 2004-804-009 BC and 2004-804-009 PC, 74°11.2′N, 81°11.7′W) were used to reconstruct changes in sea-surface conditions and to characterize changes in the depositional environment. Core 2004-804-009 PC spans the last 12 180 calibrated (cal) years BP, with sedimentation rates ranging from 45 to 122 cm/ka. Quantitative estimates of sea-surface parameters reveal relatively large hydrographic variability at millennial time scale. Before 11 000 cal years BP, our records suggest terrigenous inputs related to the last deglaciation. Between 11 000 and 9600 cal years BP, harsh conditions prevailed with August sea-surface temperatures <2 °C and the dominance of heterotrophic taxa. This episode was followed by a gradual increase in the relative abundance of phototrophic taxa and the establishment of milder condition with sea-surface temperature (SST) reaching ∼2 °C ∼8300 cal years BP, possibly related to increased exchange between the Arctic Ocean and the North Atlantic Ocean. From 6000 cal years BP to the late Holocene, climate variability could be the results of changes in the synoptic-scale atmospheric pattern such as the Arctic oscillation.

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