Climate Forecast System Reanalysis(CFSR)是美国国家环境预报中心利用全球预报系统反演的全球再分析数据产品,包含1979—2014年的气温、降水、风速、太阳辐射和相对湿度资料。以往的研究较少考虑CFSR数据集除降水外的其他气象因素对...Climate Forecast System Reanalysis(CFSR)是美国国家环境预报中心利用全球预报系统反演的全球再分析数据产品,包含1979—2014年的气温、降水、风速、太阳辐射和相对湿度资料。以往的研究较少考虑CFSR数据集除降水外的其他气象因素对流域水循环模拟精度的影响。以辉发河流域为研究区,在比较CFSR数据集和实测气象数据精度的基础上,采用SWAT模型,从径流模拟和蒸散发两个角度评价了CFSR数据集在该流域的适宜性。结果表明:(1)在径流模拟方面,CFSR数据集日尺度的R 2和NS值范围为0.57~0.71,月尺度为0.72~0.82,均表现较好。CFSR数据集对春季径流存在一定程度的高估,相对偏差为32.61%;(2)采用CFSR数据集作为模型输入,其模拟的PET和ET均高于实测气象数据的模拟结果,即使将CFSR中的降水替换为实测降水数据,ET仍存在一定程度的高估。综上所述,在将CFSR数据集应用于流域水循环模拟时,应全面评价CFSR中各气象因子的精度及其对水循环各组分模拟结果的影响,对数据集中各要素进行全面校正可能会得到更为准确的模拟结果。展开更多
The spatial variations of phytoplankton community structure in the Xiamen Western Bay during the summer and autumn cruises in 2001 were investigated based on HPLC analysis of photosynthetic pigments in algal cells and...The spatial variations of phytoplankton community structure in the Xiamen Western Bay during the summer and autumn cruises in 2001 were investigated based on HPLC analysis of photosynthetic pigments in algal cells and CHEMTAX processing of pigment data. The Chl a concentration reached 18.9 μg/L in the summer and declined to 0.28–2.17 in the autumn, respectively, consistent with the observation of diatom blooms in June. Among the accessory pigments, fucoxanthin was consistently the most abundant, ranging from 0.172 to 8.46 μg/L, with the maximum concentrations in June. 19’- hexfucoxanthin and alloxanthin were the other two abundant pigments in the summer and autumn. In addition, 19’-butanoyloxyfucoxanthin or peridinin was also important in late autumn. Generally the biomass of all the phytoplankton or each group was higher in the inner part than the mouth of this bay, represented by Chl a. CHEMTAX processing revealed the dominance of diatoms with their contribution of 14.6%–52.5% to the total Chl a, but its importance decreased in the autumn. Cryptophytes and Haptophytes, with an average contribution of 16.9%–31.4% and 12.1%–26.3%, were the other two important groups, especially in the autumn. On the contrary, Dinoflagellates and Chlorophytes were the minor groups, but the former became important sporadically in the autumn. It was suggested that there was distinctive variation in both the phytoplankton community structure and biomass between summer and autumn in the Xiamen Western Bay and the latter was coupled to the changes in temperature and dissolved oxygen. However, the spatial variation of the phytoplankton community structure was not as clear as the trend in the biomass of phytoplankton among all the sites in this bay.展开更多
文摘Climate Forecast System Reanalysis(CFSR)是美国国家环境预报中心利用全球预报系统反演的全球再分析数据产品,包含1979—2014年的气温、降水、风速、太阳辐射和相对湿度资料。以往的研究较少考虑CFSR数据集除降水外的其他气象因素对流域水循环模拟精度的影响。以辉发河流域为研究区,在比较CFSR数据集和实测气象数据精度的基础上,采用SWAT模型,从径流模拟和蒸散发两个角度评价了CFSR数据集在该流域的适宜性。结果表明:(1)在径流模拟方面,CFSR数据集日尺度的R 2和NS值范围为0.57~0.71,月尺度为0.72~0.82,均表现较好。CFSR数据集对春季径流存在一定程度的高估,相对偏差为32.61%;(2)采用CFSR数据集作为模型输入,其模拟的PET和ET均高于实测气象数据的模拟结果,即使将CFSR中的降水替换为实测降水数据,ET仍存在一定程度的高估。综上所述,在将CFSR数据集应用于流域水循环模拟时,应全面评价CFSR中各气象因子的精度及其对水循环各组分模拟结果的影响,对数据集中各要素进行全面校正可能会得到更为准确的模拟结果。
基金The National Natural Science Funds of China under contract No. 40906068the Natural Science Foundation of Guangdong Province, China under contract No. 9451063201002243the Fundamental Research Funds for the Central Universities
文摘The spatial variations of phytoplankton community structure in the Xiamen Western Bay during the summer and autumn cruises in 2001 were investigated based on HPLC analysis of photosynthetic pigments in algal cells and CHEMTAX processing of pigment data. The Chl a concentration reached 18.9 μg/L in the summer and declined to 0.28–2.17 in the autumn, respectively, consistent with the observation of diatom blooms in June. Among the accessory pigments, fucoxanthin was consistently the most abundant, ranging from 0.172 to 8.46 μg/L, with the maximum concentrations in June. 19’- hexfucoxanthin and alloxanthin were the other two abundant pigments in the summer and autumn. In addition, 19’-butanoyloxyfucoxanthin or peridinin was also important in late autumn. Generally the biomass of all the phytoplankton or each group was higher in the inner part than the mouth of this bay, represented by Chl a. CHEMTAX processing revealed the dominance of diatoms with their contribution of 14.6%–52.5% to the total Chl a, but its importance decreased in the autumn. Cryptophytes and Haptophytes, with an average contribution of 16.9%–31.4% and 12.1%–26.3%, were the other two important groups, especially in the autumn. On the contrary, Dinoflagellates and Chlorophytes were the minor groups, but the former became important sporadically in the autumn. It was suggested that there was distinctive variation in both the phytoplankton community structure and biomass between summer and autumn in the Xiamen Western Bay and the latter was coupled to the changes in temperature and dissolved oxygen. However, the spatial variation of the phytoplankton community structure was not as clear as the trend in the biomass of phytoplankton among all the sites in this bay.
