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Role of sea level pressure in variations of the canadian arctic archipelago throughflow

Advances in Climate Change Research 2021年第4期12卷 539-552页

作者： ZHANG Yu CHEN Chang-Sheng SHEN Xin-Yi XU Dan-Ya SHAO Wei-Zeng Robert C.BEARDSLEY CHANG Liang FENG Gui-Ping College of Marine Sciences Shanghai Ocean UniversityShanghai201306China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519082China International Center for Marine Studies Shanghai Ocean UniversityShanghai201306China School for Marine Science and Technology University of Massachusetts-DartmouthNew Bedford02744USA Department of Physical Oceanography Woods Hole Oceanographic InstitutionWoods Hole02543USA

The throughflow in the canadian arctic archipelago(CAA)had a significant impact on the North Atlantic Ocean with the arctic climate *** findings of physical mechanisms driving the throughflow in the CAA differed and few studies about the impact of sea level pressure(SLP)on the CAA throughflow were made.A high-resolution ice-ocean coupled arctic Ocean Finite-Volume Community Ocean Model(AO-FVCOM)was used over the period 1978-2016 to examine the interannual and seasonal variability of the outflows in the CAA and the mechanism of SLP in driving the variation of the CAA throughflow *** simulated volume transport through Davis Strait,Nares Strait,Lancaster Sound and Jones Sound showed consistent increasing trends over 1978-2016 and the larger flux in winter and spring than in summer and *** variation of volume transport through Nares Strait contributed more than Lancaster and Jones Sound to the variation through Davis *** process-oriented experiments were made to further explore the role of SLP in setting up and controlling the sea surface height(SSH)difference and thus the throughflow transport in the *** SLP was a primary forcing to control the SSH difference and the outflow transport compared with the wind *** memory of the SSH to the SLP was short and an equilibrium state could be reached if the SLP varied with *** upstream and downstream SLP difference,however,made a slight direct contribution to driving the volume transport of the CAA *** addition to the external forcing of SLP and wind,the variability of the CAA outflow was also influenced by the variability of the inflow/outflow and SSH on boundaries connected to the Pacific and Atlantic *** choice of SLP datasets from CORE-v2,ECMWF and NCEP was sensitive to the simulated uncertainty of volume transport.

关键词： Sea level pressure Volume transport canadian arctic archipelago FVCOM Sea surface height

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Variation of sea ice and perspectives of the Northwest Passage in the arctic Ocean

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Advances in Climate Change Research 2021年第4期12卷 447-455页

作者： CHEN Jin-Lei KANG Shi-Chang GUO Jun-Ming XU Min ZHANG Zhi-Min State Key Laboratory of Cryosphere Sciences Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou730000China Centre for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of SciencesBeijing100101China Gansu Construction Vocational Technology College Lanzhou730000China

The continued warming of the arctic atmosphere and ocean has led to a record retreat of sea ice in the last *** retreat has increased the probability of the opening of the arctic Passages in the near *** Northwest Passage(NWP)is the most direct shipping route between the Atlantic and Pacific Oceans,producing notable economic *** variations of sea ice and its influencing factors from a high-resolution unstructured-grid finite-volume community ocean model were investigated along the NWP in 1988-2016,and the accessibility of the NWP was assessed under shared socioeconomic pathways(SSP245 and 585)and two vessel classes with the arctic transportation acces-sibility model in *** ice thickness has decreased with increasing seawater temperature and salinity,especially within the canadian arctic archipelago(CAA)in 1988-2016,which has facilitated the opening of the *** ship navigation is projected to be possible for polar class 6 ships in August-December in 2021-2025,after when it may extends to July under SSP585 in 2026-2030,while open water ships will not be able to pass through the NWP until September in mid-21st *** navigability of the NWP is mainly affected by the ice within the *** the accessibility of the Parry Channel,the west part is worse than that of the eastern part,especially in the Viscount-Melville Sound.

关键词： arctic Sea ice Northwest passage canadian arctic archipelago Strait

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