HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Field Science Center for Northern Biosphere >
Peer-reviewed Journal Articles, etc >

The Effect of Basal Melting of the Shirase Glacier Tongue on the CO2 System in Lutzow-Holm Bay, East Antarctica

Files in This Item:
2020JG005762.pdf4.06 MBPDFView/Open
Please use this identifier to cite or link to this item:

Title: The Effect of Basal Melting of the Shirase Glacier Tongue on the CO2 System in Lutzow-Holm Bay, East Antarctica
Authors: Kiuchi, Masaaki Browse this author
Nomura, Daiki Browse this author →KAKEN DB
Hirano, Daisuke Browse this author
Tamura, Takeshi Browse this author →KAKEN DB
Hashida, Gen Browse this author →KAKEN DB
Ushio, Shuki Browse this author →KAKEN DB
Simizu, Daisuke Browse this author
Ono, Kazuya Browse this author →KAKEN DB
Aoki, Shigeru Browse this author →KAKEN DB
Keywords: Antarctica
sea ice
Southern Ocean
Issue Date: 7-Apr-2021
Publisher: American Geophysical Union
Journal Title: Journal of geophysical research biogeosciences
Volume: 126
Issue: 5
Start Page: e2020JG005762
Publisher DOI: 10.1029/2020JG005762
Abstract: To clarify the effect of basal melting of ice tongues/ice shelf on the CO2 system in the Antarctic continental margin, seawater samples were collected for analysis of dissolved inorganic carbon (DIC), total alkalinity (TA), nutrients, chlorophyll a (chl.a), and oxygen isotopic ratios at the ice front of the Shirase Glacier Tongue (SGT) in Lutzow-Holm Bay (LHB), East Antarctica during the summers of 2017 and 2018. At depths greater than similar to 20 dbar in LHB, CO2 system parameters were strongly influenced by the dilution effect of SGT basal melting and the inflow of modified Circumpolar Deep Water (mCDW). The distributions of DIC and TA agreed well with an offshore origin of mCDW that flowed beneath the SGT and mixing of basal meltwater and mCDW beneath the SGT. The fraction of SGT meltwater was highest at the station near the ice front. Dilution by SGT basal meltwater reduced the partial pressure of CO2 in the mCDW from 431 to 387 mu atm. The water then became a sink rather than source of atmospheric CO2. In the sea surface, DIC and TA were strongly influenced by biological processes. Salinity-normalized DIC decreased with the increase of salinity-normalized TA in accord with 106:16 C:N molar stoichiometry; the chl.a concentration at the sea surface was as high as 31 mu g L-1.
Type: article
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 野村 大樹

Export metadata:

OAI-PMH ( junii2 , jpcoar_1.0 )

MathJax is now OFF:


 - Hokkaido University