黑碳(BC)作为可吸入颗粒物PM_(2.5)的重要组成部分,由于其特殊的理化性质,对大气环境和人类健康构成严重威胁。目前,我国尚未建立完善的大气黑碳浓度地面观测网络和数据共享体系,区域尺度黑碳浓度产品的精度验证和适用性评价比较有限。...黑碳(BC)作为可吸入颗粒物PM_(2.5)的重要组成部分,由于其特殊的理化性质,对大气环境和人类健康构成严重威胁。目前,我国尚未建立完善的大气黑碳浓度地面观测网络和数据共享体系,区域尺度黑碳浓度产品的精度验证和适用性评价比较有限。本文从已发表文献中提取我国126个站点的1616个BC月监测数据,时间跨度为2000−2020年,对MERRA-2(Modern-Era Retrospective Analysis for Research and Applications,Version 2)和TAP(Tracking Air Pollution in China)的BC数据进行全面的精度验证和适用性评价。结果表明:①MERRA-2与TAP均低估了我国大气BC浓度,其中MERRA-2低估程度为8.13%,TAP低估程度为19.51%。TAP的大气BC浓度与地面站点监测数据的相关性〔R=0.62,模拟实测两倍因子(FAC2)=0.69〕高于MERRA-2(R=0.46,FAC2=0.58),MERRA-2的20年平均大气BC浓度(3.61μg/m^(3))更接近地面站点平均大气BC浓度(3.97μg/m^(3))。②MERRA-2和TAP的大气BC浓度在我国不同地区的精度存在较大差别,MERRA-2在我国华北和西南地区的精度优于TAP。两个数据集在西南地区都有较高的精度(R为0.68~0.84,FAC2为0.71~0.79),在华北地区精度均较低(R为0.41~0.48,FAC2为0.64~0.77)。③MERRA-2与TAP大气BC浓度在全国大部分地区呈显著正相关,其中,二者在四川省大气BC浓度差异(0.0045μg/m^(3))最小,在北京市差异(2.11μg/m^(3))最大。研究显示,MERRA-2有更长的时间跨度,而TAP更能准确表现大气BC浓度的空间分布,且二者在不同地区表现出较大差异。展开更多
利用1981年-2010年西北地区夏季降水观测数据和MEERA(Modem-Era Retrospective Analysis for Research and Applications)再分析资料,耦合DEM(Digital Elevation Model)数据,采用基于区域分月的多元回归算法,建立模型进行降水估算。结...利用1981年-2010年西北地区夏季降水观测数据和MEERA(Modem-Era Retrospective Analysis for Research and Applications)再分析资料,耦合DEM(Digital Elevation Model)数据,采用基于区域分月的多元回归算法,建立模型进行降水估算。结果表明,6月、7月、8月和夏季平均绝对误差分别为8.0 mm、8.0 mm、7.9 mm、20.8mm,平均相对误差分别为19.0%、14.4%、22.2%、15.0%,模型估算结果较MERRA降水资料误差明显减小。模型估算结果不仅保持着原始MERRA降水产品的分布特征,而且可以精细反映局部降水分布特征。展开更多
The sulfur pollutants are the source of a sizeable portion of the air pollution. In this work, the recent spatiotemporal distribution and trend of the mass concentration of two of the critical sulfur pollutants, SO2 a...The sulfur pollutants are the source of a sizeable portion of the air pollution. In this work, the recent spatiotemporal distribution and trend of the mass concentration of two of the critical sulfur pollutants, SO2 and SO4, in addition to the aerosol optical properties (AOD) were analyzed over the region of the Middle East and North Africa (MENA) from satellite and Modern Era-Retrospective Analysis for Research and Applications version 2 (MERRA-2) reanalysis data. The SO2 and SO4 data used in these analyses are obtained from (MERRA-2) with a resolution of 0.5° × 0.625° throughout a period of 10 years (2005-2015). On the other hand, the temporal trend and spatial distribution of AOD were identified from four different satellite data. 1) moderate-resolution imaging spectroradiometer (MODIS) Level 3 AOD data at 550 nm wavelengths from Collection 6 algorithm (combined dark target and deep blue algorithms) are used for 10 years temporal analysis (2006-2015). 2) Multi-angle imaging spectroradiometer (MISR) with 0.5 deg spatial resolution for the same 10 years (2006-2015). 3) Sea-Viewing Wide Field-of-View Sensor (SeaWIFS) with 0.5 deg for the period (2005-2010). 4) Ozone Monitoring Instrument (OMI) AOD at 500 nm wavelength with resolution 1 degree. This study presents more resent 10 years of Spatiotemporal of SO2, SO4 and AOD over MENA domain.展开更多
文摘黑碳(BC)作为可吸入颗粒物PM_(2.5)的重要组成部分,由于其特殊的理化性质,对大气环境和人类健康构成严重威胁。目前,我国尚未建立完善的大气黑碳浓度地面观测网络和数据共享体系,区域尺度黑碳浓度产品的精度验证和适用性评价比较有限。本文从已发表文献中提取我国126个站点的1616个BC月监测数据,时间跨度为2000−2020年,对MERRA-2(Modern-Era Retrospective Analysis for Research and Applications,Version 2)和TAP(Tracking Air Pollution in China)的BC数据进行全面的精度验证和适用性评价。结果表明:①MERRA-2与TAP均低估了我国大气BC浓度,其中MERRA-2低估程度为8.13%,TAP低估程度为19.51%。TAP的大气BC浓度与地面站点监测数据的相关性〔R=0.62,模拟实测两倍因子(FAC2)=0.69〕高于MERRA-2(R=0.46,FAC2=0.58),MERRA-2的20年平均大气BC浓度(3.61μg/m^(3))更接近地面站点平均大气BC浓度(3.97μg/m^(3))。②MERRA-2和TAP的大气BC浓度在我国不同地区的精度存在较大差别,MERRA-2在我国华北和西南地区的精度优于TAP。两个数据集在西南地区都有较高的精度(R为0.68~0.84,FAC2为0.71~0.79),在华北地区精度均较低(R为0.41~0.48,FAC2为0.64~0.77)。③MERRA-2与TAP大气BC浓度在全国大部分地区呈显著正相关,其中,二者在四川省大气BC浓度差异(0.0045μg/m^(3))最小,在北京市差异(2.11μg/m^(3))最大。研究显示,MERRA-2有更长的时间跨度,而TAP更能准确表现大气BC浓度的空间分布,且二者在不同地区表现出较大差异。
文摘利用1981年-2010年西北地区夏季降水观测数据和MEERA(Modem-Era Retrospective Analysis for Research and Applications)再分析资料,耦合DEM(Digital Elevation Model)数据,采用基于区域分月的多元回归算法,建立模型进行降水估算。结果表明,6月、7月、8月和夏季平均绝对误差分别为8.0 mm、8.0 mm、7.9 mm、20.8mm,平均相对误差分别为19.0%、14.4%、22.2%、15.0%,模型估算结果较MERRA降水资料误差明显减小。模型估算结果不仅保持着原始MERRA降水产品的分布特征,而且可以精细反映局部降水分布特征。
文摘The sulfur pollutants are the source of a sizeable portion of the air pollution. In this work, the recent spatiotemporal distribution and trend of the mass concentration of two of the critical sulfur pollutants, SO2 and SO4, in addition to the aerosol optical properties (AOD) were analyzed over the region of the Middle East and North Africa (MENA) from satellite and Modern Era-Retrospective Analysis for Research and Applications version 2 (MERRA-2) reanalysis data. The SO2 and SO4 data used in these analyses are obtained from (MERRA-2) with a resolution of 0.5° × 0.625° throughout a period of 10 years (2005-2015). On the other hand, the temporal trend and spatial distribution of AOD were identified from four different satellite data. 1) moderate-resolution imaging spectroradiometer (MODIS) Level 3 AOD data at 550 nm wavelengths from Collection 6 algorithm (combined dark target and deep blue algorithms) are used for 10 years temporal analysis (2006-2015). 2) Multi-angle imaging spectroradiometer (MISR) with 0.5 deg spatial resolution for the same 10 years (2006-2015). 3) Sea-Viewing Wide Field-of-View Sensor (SeaWIFS) with 0.5 deg for the period (2005-2010). 4) Ozone Monitoring Instrument (OMI) AOD at 500 nm wavelength with resolution 1 degree. This study presents more resent 10 years of Spatiotemporal of SO2, SO4 and AOD over MENA domain.
