scholarly journals Mechanisms delaying glacier retreat in the presence of ocean temperature variability at Thwaites Glacier, Antarctica

2021 ◽  
Author(s):  
Matthew Hoffman
Keyword(s):  
Temperature Variability ◽  
Glacier Retreat ◽  
Ocean Temperature

Foraminiferal proxy response to ocean temperature variability and acidification over the last 150 years in the Santa Barbara Basin (California)

2018 ◽  
Vol 469 ◽  
pp. 141-150 ◽  
Author(s):  
Dorothy K. Pak ◽  
Ingrid L. Hendy ◽  
James C. Weaver ◽  
Arndt Schimmelmann ◽  
Lily Clayman
Keyword(s):  
Temperature Variability ◽  
Ocean Temperature ◽  
Santa Barbara ◽  
Santa Barbara Basin

scholarly journals Role of Kuroshio Current in fish resource variability off southwest Japan

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Yushi Morioka ◽  
Sergey Varlamov ◽  
Yasumasa Miyazawa
Keyword(s):  
Rossby Waves ◽  
Kuroshio Current ◽  
Temperature Variability ◽  
Western Boundary ◽  
Ocean Temperature ◽  
Western Boundary Currents ◽  
Boundary Currents ◽  
Subsurface Ocean ◽  
Resource Variability ◽  
The Kuroshio

AbstractWestern boundary currents in the subtropics play a pivotal role in transporting warm water from the tropics that contribute to development of highly diverse marine ecosystem in the coastal regions. As one of the western boundary currents in the North Pacific, the Kuroshio Current (hereafter the Kuroshio) exerts great influences on biological resource variability off southwest Japan, but few studies have examined physical processes that attribute the coastal fish resource variability to the basin-scale Kuroshio variability. Using the high-quality fish catch data and high-resolution ocean reanalysis results, this study identifies statistical links of interannual fish resource variability off Sukumo Bay, Shikoku island of Japan, to subsurface ocean temperature variability in the Kuroshio. The subsurface ocean temperature variability off the south of Sukumo Bay exhibits vertically coherent structure with sea-surface height variability, which originates from the westward-propagating oceanic Rossby waves generated through surface wind anomalies in the Northwest Pacific. Although potential sources of the atmospheric variability remain unclarified, the remotely-induced oceanic Rossby waves contribute to fish resource variability off Sukumo Bay. These findings have potential applications to other coastal regions along the western boundary currents in the subtropics where the westward-propagating oceanic Rossby waves may contribute to coastal ocean temperature variability.

scholarly journals Decadal upper ocean temperature variability in the tropical Pacific

2001 ◽  
Vol 106 (C5) ◽  
pp. 8971-8988 ◽  
Author(s):  
Wilco Hazeleger ◽  
Martin Visbeck ◽  
Mark Cane ◽  
Alicia Karspeck ◽  
Naomi Naik
Keyword(s):  
Tropical Pacific ◽  
Temperature Variability ◽  
Upper Ocean ◽  
Ocean Temperature ◽  
The Tropical Pacific

scholarly journals Adiabatic and diabatic signatures of ocean temperature variability

2021 ◽  
pp. 1-39
Keyword(s):  
Climate Model ◽  
Southern Oscillation ◽  
Temperature Variability ◽  
Ocean Temperature ◽  
Mixing Processes ◽  
Temperature Changes ◽  
Modes Of Variability ◽  
Natural Modes ◽  
Rigorous Framework ◽  
Long Term Trends

Abstract Anthropogenically induced radiative imbalances in the climate system lead to a slow accumulation of heat in the ocean. This warming is often obscured by natural modes of climate variability such as the El Niño-Southern Oscillation (ENSO), which drive substantial ocean temperature changes as a function of depth and latitude. The use of watermass coordinates has been proposed to help isolate forced signals and filter out fast adiabatic processes associated with modes of variability. However, how much natural modes of variability project into these different coordinate systems has not been quantified. Here we apply a rigorous framework to quantify ocean temperature variability using both a quasi-Lagrangian, watermass-based temperature coordinate and Eulerian depth and latitude coordinates in a free-running climate model under pre-industrial conditions. The temperature-based coordinate removes the adiabatic component of ENSO-dominated interannual variability by definition, but a substantial diabatic signal remains. At slower (decadal to centennial) frequencies, variability in the temperature- and depth-based coordinates is comparable. Spectral analysis of temperature tendencies reveals the dominance of advective processes in latitude and depth coordinates while the variability in temperature coordinates is related closely to the surface forcing. Diabatic mixing processes play an important role at slower frequencies where quasi steady-state balances emerge between forcing and mixing in temperature, advection and mixing in depth, and forcing and advection in latitude. While watermass-based analyses highlight diabatic effects by removing adiabatic variability, our work shows that natural variability has a strong diabatic component and cannot be ignored in the analysis of long term trends.

scholarly journals Estimating Greenland tidewater glacier retreat driven by submarine melting

2019 ◽  
Vol 13 (9) ◽  
pp. 2489-2509 ◽  
Author(s):  
Donald A. Slater ◽  
Fiamma Straneo ◽  
Denis Felikson ◽  
Christopher M. Little ◽  
Heiko Goelzer ◽  
...  
Keyword(s):  
North Atlantic Ocean ◽  
Ice Sheet ◽  
Greenland Ice Sheet ◽  
Glacier Retreat ◽  
Ocean Temperature ◽  
Position Change ◽  
Tidewater Glaciers ◽  
The North ◽  
Glacier Terminus ◽  
Tidewater Glacier

Abstract. The effect of the North Atlantic Ocean on the Greenland Ice Sheet through submarine melting of Greenland's tidewater glacier calving fronts is thought to be a key driver of widespread glacier retreat, dynamic mass loss and sea level contribution from the ice sheet. Despite its critical importance, problems of process complexity and scale hinder efforts to represent the influence of submarine melting in ice-sheet-scale models. Here we propose parameterizing tidewater glacier terminus position as a simple linear function of submarine melting, with submarine melting in turn estimated as a function of subglacial discharge and ocean temperature. The relationship is tested, calibrated and validated using datasets of terminus position, subglacial discharge and ocean temperature covering the full ice sheet and surrounding ocean from the period 1960–2018. We demonstrate a statistically significant link between multi-decadal tidewater glacier terminus position change and submarine melting and show that the proposed parameterization has predictive power when considering a population of glaciers. An illustrative 21st century projection is considered, suggesting that tidewater glaciers in Greenland will undergo little further retreat in a low-emission RCP2.6 scenario. In contrast, a high-emission RCP8.5 scenario results in a median retreat of 4.2 km, with a quarter of tidewater glaciers experiencing retreat exceeding 10 km. Our study provides a long-term and ice-sheet-wide assessment of the sensitivity of tidewater glaciers to submarine melting and proposes a practical and empirically validated means of incorporating ocean forcing into models of the Greenland ice sheet.

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