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首页> 外文会议>Asian conference on remote sensingACRS >EVALUATION OF ATMOSPHERIC WATER VAPOR PRODUCT FROM THE MODIS ONLINE VISUALIZATION AND ANALYSIS SYSTEM DURING THE SUMMER OF 2015
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EVALUATION OF ATMOSPHERIC WATER VAPOR PRODUCT FROM THE MODIS ONLINE VISUALIZATION AND ANALYSIS SYSTEM DURING THE SUMMER OF 2015

机译：2015年夏季从MODIS在线可视化和分析系统评估大气水蒸气产品

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Atmospheric water vapor plays a significant role in radiation balance and biogeochemical processes. As the primary greenhouse gas, its quantification is very essential in a wide range of application such as numerical weather prediction, radiative transfer modeling, regional climate modeling, and air quality studies. Columnar measurements of water vapor, or precipitable water (PW) are necessary in many of these applications and can be obtained by remote sensing and in-situ methods. Moderate Resolution Imaging Spectroradiometer (MODIS) onboard the polar-orbiting Terra and Aqua platforms, can monitor precipitable water with high accuracy and large scales over land and ocean, using near-infrared (nIR) bands on clear sky conditions. The MODIS nIR PW is only available during daytime, which can be retrieved at 1°×1° spatial resolution from the MODIS Online Visualization and Analysis System (MOVAS). MODIS water vapor product at the 931-941 nm bandwidth was evaluated by comparing with coincidental ground-based measurements of PW using a handheld spectral solar radiometer (Microtops Ⅱ) measuring PW at 936 nm during a measurement campaign of the summer of 2015. Further, PW values derived from atmospheric soundings by the nearest radiosonde station were used to evaluate the accuracy of the different PW measurements. Systematic comparisons among the different platforms, i.e. bivariate correlation, absolute and relative root mean square error, absolute and relative mean biased error were performed. Multiple linear regression analysis to calibrate the MODIS PW from the nIR band using Microtops Ⅱ and radiosonde observations within MODIS image coverage are presented and assessed.
机译：大气水蒸气在辐射平衡和生物地球化学过程中起着重要作用。作为主要温室气体，其量化在广泛的应用中是非常重要的，如数值天气预报，辐射转移建模，区域气候建模和空气质量研究。这些应用中的许多应用中需要柱状测量或沉淀的水（PW），并且可以通过遥感和原位方法获得。适度的分辨率成像光谱辐射器（MODIS）底座轨道轨道地板和Aqua平台，可以在晴空条件下使用近红外（NIR）带，在陆地和海洋上监控可降低的水分和大规模。 MODIS NIR PW仅在白天可用，可以从MODIS在线可视化和分析系统（MOVA）以1°×1°空间分辨率检索。通过在2015年夏季测量活动期间使用936nm的PW使用PW使用PW的PW的巧合地面基于PW的巧合地面测量来评估MODIS水蒸气产品。进一步，通过最近的无线电电站源自大气探测的PW值用于评估不同PW测量的准确性。在不同平台中进行系统比较，即二进制相关，绝对和相对根均方误差，绝对和相对平均偏置误差。使用MicrootopsⅡ校准从NIR带校准MODIS PW的多元线性回归分析，并介绍了MODIS图像覆盖范围内的无线电探测器观察。

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