季风影响下北部湾颗粒无机碳浓度时空变化特征

Influence of Monsoon on Temperal-spatial Distribution of Particulate Inorganic Carbon Concentrationtime in the Beibu Gulf

以北部湾1999年7月至2009年6月11年的Sea Wi FS卫星遥感颗粒无机碳度资料为基础,研究北部湾颗粒无机碳浓度的时空分布特征,并初步探讨其可能的海洋动力调控机制。结果表明:在季节变化上,整个冬季北部湾颗粒无机碳浓度普遍较高,表现出季节平均最大值(0.012 mol·m-3),春季普遍较低(<0.004 mol·m-3),表现出全年最低水平;不同区域的最高水平出现的季节却有所不同:北部湾北部沿岸区域颗粒无机碳浓度在秋季较高,海南岛西部大部分海域在冬季较高,北部湾西北部沿岸则在夏季较高;在空间分布上,近岸海区的颗粒无机碳浓度明显高于海湾中央区域,北部湾北部海域普遍高于南部海域,东部海域高于西部海域。综合相关分析表明,北部湾颗粒无机碳浓度的这一时空分布特征主要同季风的强弱及风向有关,同时也可能与海表温度、流场(如沿岸上升流等)及陆地径流量等有关。

Based on 10 years＇ Sea Wi FS paritculate inorganic carbon（PIC） concentration data from July 1999-June 2009,the authors analyzed the temporal and spatial variation of PIC in the Beibu Gulf. Seasonally, the PIC was generally high in winter, with the highest value of 0.012 mol.m^-3 for the whole Gulf, and was low in spring with the smallest value. PIC was the highest in autumn in the north of the Beibu Gulf. In west of Hainan Island, the highest level of PIC appeared in winter. However in northwest of the Beibu Gulf, the highest level appeared in winter. Spatially, PIC concentration is generally higher in coastal areas than that in the central Gulf, higher in the north areas than that in south areas, and higher in the east of the Gulf than that in the west of the Gulf. The result of the correlation analysis indicated that temporal-spatial variation of PIC concentrations was mainly regulated by moonsoon wind, as well as sea surface temperature, current and terrestrial input.