Water Balance App

<p style='background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border: 0px; margin-top: 0px; margin-bottom: 10px; padding: 0px; vertical-align: baseline;'>Click anywhere on earth to see how the water balance is changing over time. This app is based on data from <a href='https://ldas.gsfc.nasa.gov/' target='_blank'>GLDAS version 2.1</a>, which uses weather observations like temperature, humidity, and rainfall to run the <a href='https://www.jsg.utexas.edu/noah-mp' style='background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border: 0px; margin: 0px; padding: 0px; vertical-align: baseline; cursor: pointer;'>Noah </a>land surface model. This model estimates how much of the rain becomes runoff, how much evaporates, and how much infiltrates into the soil. These output variables, calculated every three hours, are aggregated into monthly averages, giving us a record of the hydrologic cycle going all the way back to January 2000. </p><p style='background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border: 0px; margin-top: 0px; margin-bottom: 10px; padding: 0px; vertical-align: baseline;'>Because the model is run with 0.25 degree spatial resolution (~30 km), these data should only be used for regional analysis. A specific farm or other small area might experience very different conditions than the region around it, especially because human influences like irrigation are not included.</p><p style='background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border: 0px; margin-top: 0px; margin-bottom: 10px; padding: 0px; vertical-align: baseline;'>This app can also be seen as a useful template for sharing other climate datasets. If you would like to customize it for your own organization, or use it as a starting point for your own scientific application, the source code is <a href='https://github.com/vannizhang/waterbalance' style='background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border: 0px; margin: 0px; padding: 0px; vertical-align: baseline; cursor: pointer;'>available on github</a> for anyone to use. </p>

<p style='background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border: 0px; margin-top: 0px; margin-bottom: 10px; padding: 0px; vertical-align: baseline;'>点击地球上任意位置，即可查看该区域的水平衡随时间的变化情况。本应用基于<a href='https://ldas.gsfc.nasa.gov/' target='_blank'>全球陆面数据同化系统（GLDAS）2.1版本</a>的数据研发，该系统借助气温、湿度、降水等气象观测数据驱动<a href='https://www.jsg.utexas.edu/noah-mp' style='background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border: 0px; margin: 0px; padding: 0px; vertical-align: baseline; cursor: pointer;'>Noah陆面模型（Noah land surface model）</a>。该模型可估算降雨分别有多少形成地表径流、多少发生蒸发以及多少渗入土壤。这些每3小时计算一次的输出变量会被聚合为月平均值，由此可得到自2000年1月起的水文循环观测记录。</p><p style='background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border: 0px; margin-top: 0px; margin-bottom: 10px; padding: 0px; vertical-align: baseline;'>由于该模型的空间分辨率为0.25度（约30千米），因此这些数据仅适用于区域尺度分析。单个农场或其他小型区域的水文状况可能与其周边区域存在显著差异，尤其是该模型未考虑灌溉等人类活动的影响。</p><p style='background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border: 0px; margin-top: 0px; margin-bottom: 10px; padding: 0px; vertical-align: baseline;'>本应用也可作为共享其他气候数据集的实用模板。若您希望为所在机构定制该应用，或是将其作为自身科研应用的开发起点，其源代码可在<a href='https://github.com/vannizhang/waterbalance' style='background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border: 0px; margin: 0px; padding: 0px; vertical-align: baseline; cursor: pointer;'>GitHub</a>上获取，供所有人使用。</p>