南海北部表层颗粒有机碳的季节和年际变化遥感分析

发布时间：2018-05-08 00:18

本文选题：南海北部 + 颗粒有机碳　；参考：《海洋学报》2017年03期

【摘要】：海洋颗粒有机碳(POC)是海洋固碳的一个关键参数。为了研究南海北部陆架及海盆表层POC浓度的时空分布特征以及变化趋势,本文利用2009-2011年4个季节的实测数据,对NASA发布的MODIS/AQUA卫星月平均POC遥感产品,进行了验证和校正;并利用校正后的遥感数据分析了2003-2014年POC的时空分布特征和变化趋势。发现POC遥感产品与南海北部实测数据具有较好的线性关系(R2=0.72),但存在系统性偏高,需利用实测数据对遥感数据进行区域性校正。分析校正后的遥感数据发现,南海北部陆架POC浓度较高,平均为(33.34±8.02)mg/m3;吕宋海峡西南海域浓度较低,平均为(29.25±6.20)mg/m3;中央海盆区浓度最低,平均为(27.02±4.84)mg/m3。春夏季POC浓度较低,最低值一般出现在5月,冬季(12月至翌年1月)POC浓度达到最高。利用2003-2014年的长时间序列遥感叶绿素(Chl a)和海表温度(SST)、混合层深度(MLD)模式数据,以及实测数据对南海北部POC浓度的影响机制进行了分析。发现POC与Chl a在秋冬呈现较好的相关关系(R2=0.51),但在春夏季较离散,表明秋冬季生物作用对POC影响较大。2003-2014年期间,POC与Chl a、MLD及SST存在明显的年际变化,但并没有显著的上升或下降趋势。
[Abstract]:Ocean particulate organic carbon (POC) is a key parameter for marine carbon sequestration. In order to study the temporal and spatial distribution and variation trend of POC concentration in the continental shelf and basin in the northern part of the South China Sea, the monthly average POC remote sensing products of MODIS/AQUA satellite released by NASA were verified and corrected by using the measured data from four seasons from 2009-2011. Based on the corrected remote sensing data, the temporal and spatial distribution characteristics and variation trend of POC from 2003 to 2014 are analyzed. It is found that the POC remote sensing product has a good linear relationship with the measured data in the northern part of the South China Sea, but the system is relatively high, so it is necessary to use the measured data to carry out the regional correction of the remote sensing data. The corrected remote sensing data show that the concentration of POC in the northern shelf of the South China Sea is relatively high, with an average of 33.34 卤8.02 mg / m3, a low concentration of 29.25 卤6.20 mg / m3 in the southwest Luzon Strait, and the lowest concentration in the Central Sea Basin with an average of 27.02 卤4.84 mg / m3. The concentration of POC in spring and summer is relatively low, and the lowest value usually occurs in May, and the highest concentration in winter (from December to January of the following year). The influence mechanism of POC concentration in the northern South China Sea was analyzed by using the model data of long time series remote sensing chlorophyll Chl a and sea surface temperature (SST), mixed layer depth (POC) data from 2003 to 2014, and the measured data were used to analyze the effects of the model data on the POC concentration in the northern part of the South China Sea. It was found that there was a good correlation between POC and Chl a in autumn and winter, but it was dispersed in spring and summer, which indicated that biological action had a great influence on POC in autumn and winter. There were obvious interannual variations between POC and Chl AMLD and SST in autumn and winter. But there is no significant upward or downward trend.
【作者单位】：国家海洋局第二海洋研究所卫星海洋环境动力学国家重点实验室;
【基金】：973项目(2015CB954002) 海洋公益项目(201505003) 国家自然科学基金项目(41476155,41322039) “全球变化与海气相互作用”专项(GASI-02-SCS-YGST01,GASI-02-PAC-YGST01,GASI-03-03-01-01)
【分类号】：P734;P714.4

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