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新卫星数据有助于农民抗旱

(2014-08-22 10:32:47)
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股票

分类: 科学与技术

http://photos.state.gov/libraries/america/3239/2014_Week_3/08182014_earth20140818-full_600.jpg

2014.08.20

美国国家航空航天局定于今年冬天发射升空的土壤水分有源-无源卫星将收集全世界的农业及水资源管理人员都需要的地方性数据。

加利福尼亚州有大约60%的地区正在经受“异常干旱”,这是美国干旱监测中心(U.S. Drought Monitor)所报告的最严重的等级。土壤中没有足够的水分,种子就不能生根,叶片就不能进行光合作用,农业生产也就无以为继。

目前还没有监测各地土壤水分的全球性网络。农民、科研人员和资源管理人员可以在土壤中放置传感器,但这些传感器只能提供点测数据,而且在非洲、亚洲和拉丁美洲的一些极其重要的农耕区罕有使用。欧洲航天局(European Space Agency)的土壤水分和海洋盐度(Soil Moisture and Ocean Salinity)观测卫星以50公里的分辨率观测土壤水分,但由于土壤水分的变化区间可能比这要小得多,该卫星的数据对于大范围预报才是最有用的。

美国国家航空航天局(NASA)即将发射土壤水分有源-无源(Soil Moisture Active Passive)卫星。这颗定于今年冬天发射升空的卫星将收集全世界的农业及水资源管理人员都需要的那些地方性数据。

土壤水分有源-无源卫星将观测地表土壤5厘米深度的水分。该卫星以大约9公里的分辨率提供土壤水分估值,每两到三天对整个地球进行一次测绘。尽管这样的分辨率无法显示在一块耕地内土壤水分可能存在的差异,但该卫星将提供迄今为止最详尽的测绘图。

美国国家航空航天局设在加州帕萨迪纳的喷气推进实验室(Jet Propulsion Laboratory)的土壤水分有源-无源卫星研发团队中研究水和碳循环的科学家纳伦德拉•达斯(Narendra Das)说:“如果种植旱作作物的农民知道土壤的湿度,他们就能安排种植时间以最大限度地提高产量。土壤水分有源-无源卫星能够帮助预测旱情的严重程度,其数据随后便能帮助农民规划如何抗旱。”



Read more: http://iipdigital.usembassy.gov/st/chinese/inbrief/2014/08/20140820306004.html#ixzz3B5IGYC9z

New Satellite Data Will Help Farmers Facing Drought

http://photos.state.gov/libraries/america/3239/2014_Week_3/08182014_earth20140818-full_600.jpg

18 August 2014

NASA’s Soil Moisture Active Passive satellite, scheduled to launch this winter, will collect the local soil-moisture data that agricultural and water managers worldwide need.

About 60 percent of California is experiencing “exceptional drought,” the U.S. Drought Monitor’s most dire classification. Without enough water in the soil, seeds can’t sprout roots, leaves can’t perform photosynthesis, and agriculture can’t be sustained.

Currently, there is no global network monitoring soil moisture at a local level. Farmers, scientists and resource managers can place sensors in the ground, but these only provide spot measurements and are rare across some critical agricultural areas in Africa, Asia and Latin America. The European Space Agency’s Soil Moisture and Ocean Salinity mission measures soil moisture at a resolution of 50 kilometers, but because soil moisture can vary on a much smaller scale, its data are most useful in broad forecasts.

Enter NASA’s Soil Moisture Active Passive (SMAP) satellite. The mission, scheduled to launch this winter, will collect the kind of local data agricultural and water managers worldwide need.

SMAP monitors the top 5 centimeters of soil on Earth’s surface. It creates soil moisture estimates with a resolution of about 9 kilometers, mapping the entire globe every two or three days. Although this resolution cannot show how soil moisture might vary within a single field, it will give the most detailed maps yet made.

“If farmers of rain-fed crops know soil moisture, they can schedule their planting to maximize crop yield,” said Narendra Das, a water and carbon cycle scientist on SMAP’s science team at NASA’s Jet Propulsion Laboratory in Pasadena, California. “SMAP can assist in predicting how dramatic drought will be, and then its data can help farmers plan their recovery from drought.”



Read more: http://iipdigital.usembassy.gov/st/english/inbrief/2014/08/20140818305928.html#ixzz3B5IIkM7u

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