登录 | 注册 | 中文  | English  | 用时: 0.54s
元数据
高级检索
首页 > 中国极地考察知识库 > 成果信息库 > 已审查 中国第26次南极考察南大洋碳通量评估

中国第26次南极考察南大洋碳通量评估

【标题】中国第26次南极考察南大洋碳通量评估

【Title】ESTIMATION ON CARBON FLUX IN THE SOUTHERN OCEAN DURING THE 26TH CHINARE

【DOI】10.13679/j.jdyj.2014.2.193

【作者】 许苏清; 陈立奇; 陈海颖

【Author】 Xu Suqing ; Chen Liqi ; Chen Haiying

【期刊】极地研究

【Journal】

【期刊年份】2014

【卷】26

【期】2

【关键词】 中国南极考察; 南大洋; 外推算法; 卫星遥感; 碳通量

【Keywords】 CHINARE; Southern Ocean; extrapolation model; remote sensing; carbon flux

【摘要】 南大洋是大气CO2的重要汇区,而近几十年来这个汇出现了明显变化并成为了研究的热点。本文利用中国第26次南极考察期间雪龙船绕南极航行所获得的现场碳及相关参数观测数据,分析推导出海水pCO2及其主控因子(叶绿素和水温)之间的经验关系,并结合相关卫星遥感数据建立遥感外推算法,计算南大洋50°S以南海区碳通量分布,评估该海区对大气CO2的吸收能力。计算结果表明,2009年11月从东经90°到西经90°(顺时针方向),南纬50°到75°海域为CO2输送大气的弱源,平均输入大气通量为9.482mol/m2*mon,碳释放量为0.0017795*1015gC;2009年12月从西经90°到东经90°(顺时针方向),南纬50°到75°海域为吸收大气CO2的弱汇,平均碳通量为-12.451mol/m2*mon,碳吸收量为0.026656*1015gC。将经验关系推导至该月份的50°S到75°S整个南大洋的计算中发现,2009年11月南大洋为大气CO2的源,碳释放量为0.0027896*1015gC;在2009年12月南大洋为大气CO2的汇,碳吸收量是-0.0035035*1015gC。相比之前我们所观测的结果,南大洋的碳汇吸收能力呈现明显下降。

【Abstract】The Southern Ocean is an important sink of atmospheric CO2 and the magnitude of the CO2 sink is heavily disputed because its ability to absorb CO2 changes significantly in the decades. An empirical relationship was deduced based on the in-situ pCO2 in the surface sea water and its main controls including Chla and SST obtained during the 26th CHINARE. An extrapolation model was found combining the empirical relationship and relative remote sensing data to compute the air-sea carbon fluxes and carbon uptake in the Southern Ocean (south of 50°S). Results of the extrapolation model show that it was a weak source of atmospheric CO2 in the area from 90°E to 90°W (clockwise), 50°S to 75°S in November, 2009 with an average flux 9.482mol/m2*mon, and carbon release was 0.0017795*1015gC. While in December, 2009, the study area from 90°E to 90°W (clockwise), 50°S to 75°S turned to be a weak sink with an average flux -12.451mol/m2*mon and carbon uptake was 0.026656*1015gC. When the empirical relationship was applied to the whole area from 50°S to 75°S, the results show in November 2009 the Southern Ocean was a source of 0.0027896*1015gC and in December 2009 it was a sink of -0.0035035*1015gC. Compared to the research results before, we found that the ability of carbon uptake decline obviously.

【基金/项目】 利用卫星遥感资料和实测数据估算南大洋碳吸收量 ; 南大洋N2O源汇格局:驱动机制及其对海洋N2O收支的影响 ; 中美合作南大洋碳循环数据分析和模式研究 ; 极区海洋大气化学合作研究

【下载】 PDF