气候变化领域集成服务门户(CCPortal): The IOD Impacts on the Indian Ocean Carbon Cycle

CCPortal

DOI	10.1029/2020JC016485
	The IOD Impacts on the Indian Ocean Carbon Cycle
	Valsala V.; Sreeush M.G.; Chakraborty K.
发表日期	2020
ISSN	21699275
卷号	125 期号:11
英文摘要	This paper examines the impacts of Indian Ocean Dipole (IOD) Mode on the upper ocean carbon cycle and its variability in the Indian Ocean with available biogeochemical observations and 60 years (1960–2019) of model outputs from a global ocean biogeochemical general circulation model. The upper ocean carbon cycle variability of the Indian Ocean is faithfully reproduced by the model when compared with available observations. The IOD leads to a substantial sea-to-air CO2 flux variability in the southeastern tropical Indian Ocean over a broad region (70–105°E, 0–20°S), with more focus near the coast of Java-Sumatra due to the prevailing upwelling dynamics and associated westward propagating anomalies. The sea-to-air CO2 fluxes, surface ocean partial pressure of CO2 (pCO2), the concentration of dissolved inorganic carbon (DIC), and ocean alkalinity (ALK) range as much as ±1.0 mole m−2 year−1, ±20 μatm, ±35 μmole kg−1, and ±22 μmole kg−1 within 80–105°E, 0–10°S due to IOD. The DIC and ALK are significant drivers of pCO2 variability associated with IOD. The roles of temperature (T) and biology are found negligible. A relatively warm T and extremely high freshwater forcing make the southeastern tropical Indian Ocean carbon cycle variability submissive to DIC and ALK evolutions in contrast to the tropical eastern Pacific where changes in DIC and T dominate the pCO2 interannual variability. For the first time, this study provides a most comprehensive and extended analysis for the region while highlighting significant differences in carbon cycle variability of the eastern tropical Indian Ocean compared to that of the other parts of the global oceans. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	air-sea CO2 flux; carbon cycle; Indian Ocean; IOD; ocean pCO2
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186594
作者单位	Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pune, India; Indian National Center for Ocean Information Services, Ministry of Earth Sciences, Hyderabad, India
推荐引用方式 GB/T 7714	Valsala V.,Sreeush M.G.,Chakraborty K.. The IOD Impacts on the Indian Ocean Carbon Cycle[J],2020,125(11).
APA	Valsala V.,Sreeush M.G.,&Chakraborty K..(2020).The IOD Impacts on the Indian Ocean Carbon Cycle.Journal of Geophysical Research: Oceans,125(11).
MLA	Valsala V.,et al."The IOD Impacts on the Indian Ocean Carbon Cycle".Journal of Geophysical Research: Oceans 125.11(2020).