气候变化领域集成服务门户(CCPortal): Mesoscale Effects on Carbon Export: A Global Perspective

CCPortal

DOI	10.1002/2017GB005751
	Mesoscale Effects on Carbon Export: A Global Perspective
	Harrison C.S.; Long M.C.; Lovenduski N.S.; Moore J.K.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	680
结束页码	703
卷号	32 期号:4
英文摘要	Carbon export from the surface to the deep ocean is a primary control on global carbon budgets and is mediated by plankton that are sensitive to physical forcing. Earth system models generally do not resolve ocean mesoscale circulation (O(10–100) km), scales that strongly affect transport of nutrients and plankton. The role of mesoscale circulation in modulating export is evaluated by comparing global ocean simulations conducted at 1° and 0.1° horizontal resolution. Mesoscale resolution produces a small reduction in globally integrated export production (<2%); however, the impact on local export production can be large (±50%), with compensating effects in different ocean basins. With mesoscale resolution, improved representation of coastal jets block off-shelf transport, leading to lower export in regions where shelf-derived nutrients fuel production. Export is further reduced in these regions by resolution of mesoscale turbulence, which restricts the spatial area of production. Maximum mixed layer depths are narrower and deeper across the Subantarctic at higher resolution, driving locally stronger nutrient entrainment and enhanced summer export production. In energetic regions with seasonal blooms, such as the Subantarctic and North Pacific, internally generated mesoscale variability drives substantial interannual variation in local export production. These results suggest that biogeochemical tracer dynamics show different sensitivities to transport biases than temperature and salinity, which should be considered in the formulation and validation of physical parameterizations. Efforts to compare estimates of export production from observations and models should account for large variability in space and time expected for regions strongly affected by mesoscale circulation. ©2018. American Geophysical Union. All Rights Reserved.
英文关键词	biophysical interactions; carbon export; Earth system model; mesoscale circulation; ocean eddies
语种	英语
scopus关键词	annual variation; biophysics; carbon flux; eddy; global ocean; global perspective; mesoscale meteorology; mesoscale motion; mixed layer; model; nutrient; plankton; simulation; subantarctic region; turbulence; Pacific Ocean; Pacific Ocean (North)
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129838
作者单位	Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, Boulder, CO, United States; Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, United States; Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder, CO, United States; Department of Earth System Science, University of California, Irvine, CA, United States
推荐引用方式 GB/T 7714	Harrison C.S.,Long M.C.,Lovenduski N.S.,et al. Mesoscale Effects on Carbon Export: A Global Perspective[J],2018,32(4).
APA	Harrison C.S.,Long M.C.,Lovenduski N.S.,&Moore J.K..(2018).Mesoscale Effects on Carbon Export: A Global Perspective.Global Biogeochemical Cycles,32(4).
MLA	Harrison C.S.,et al."Mesoscale Effects on Carbon Export: A Global Perspective".Global Biogeochemical Cycles 32.4(2018).