全球海洋碳吸收因降雨而增强，这一成果由法国索邦大学Parc, Laetitia和Bellenger, Hugo合作取得。2024年8月29日出版的《自然—地球科学》杂志发表了这一最新研究成果。
本研究基于观测产品(卫星和原位)和再分析，对2008-2018年全球海洋碳吸收的影响进行了全面估计。研究利用了海洋表面对降雨和不同降雨产品的响应不同，结果表明，在2008-2018年期间，降雨使海洋碳汇增加了+0.14-0.19PgCyr-1。代表海洋碳吸收量增加了5-7% (2.66PgCyr-1)。
降雨引起的界面通量和湿沉积具有相当的数量级。前者主要增加了热带地区的二氧化碳吸收汇，强降雨率和弱风导致了显著的盐度和二氧化碳稀释。后者在热带、风暴路径区域和南大洋非常重要。
据了解，降雨改变了局部海洋表面的物理和生物地球化学性质，但其时空变化导致其在全球海洋碳吸收的研究中被忽视。气相和液相中不同的物理和化学过程控制着大气和海洋之间二氧化碳(CO2)的转移。降雨通过(1)增加海洋湍流和(2)调节海气CO2浓度梯度来影响界面通量。与此同时，雨滴通过湿沉降将二氧化碳注入海洋。
附：英文原文
Title: Global ocean carbon uptake enhanced by rainfall
Author: Parc, Laetitia, Bellenger, Hugo, Bopp, Laurent, Perrot, Xavier, Ho, David T.
Issue&Volume: 2024-08-29
Abstract: Rain alters local sea surface physical and biogeochemical properties but its spatiotemporal variability has led to its overlook in global ocean carbon uptake studies. Different physical and chemical processes in the gaseous and liquid phases control the transfer of carbon dioxide (CO2) between the atmosphere and ocean. Rain impacts the interfacial flux by (1) increasing turbulence in the ocean and (2) modulating the air–sea CO2 concentration gradient. Concurrently, raindrops inject CO2 absorbed during their fall into the ocean through wet deposition. Here this study presents a comprehensive estimate of these effects on the global ocean carbon uptake over 2008–2018 based on observational products (satellite and in situ) and reanalysis. Using various representations of the ocean surface response to rainfall and different rain products, we show that rain increases the ocean carbon sink by +0.14–0.19PgCyr-1 over 2008–2018, representing an increase of 5–7% of the ocean carbon uptake (2.66PgCyr-1 ). Rain-induced interfacial flux and wet deposition have comparable orders of magnitude. The former mainly increases the CO2 sink in the tropics because strong rain rates and weak winds induce noticeable salinity and CO2 dilution. The latter is important in the tropics, storm track regions and the Southern Ocean.
DOI: 10.1038/s41561-024-01517-y
Source: https://www.nature.com/articles/s41561-024-01517-y