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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >SCAR-B fires in the tropics: Properties and remote sensing from EOS-MODIS
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SCAR-B fires in the tropics: Properties and remote sensing from EOS-MODIS

机译：SCAR-B在热带地区着火：EOS-MODIS的特性和遥感

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Two moderate resolution imaging spectroradiometer (MODIS) instruments are planned for launch in 1999 and 2000 on the NASA Earth Observing System (EOS) AM-1 and EOS PM-1 satellites. The MODIS instrument will sense fires with designated 3.9 and 11 mu m channels that saturate at high temperatures (450 and 400 K, respectively). MODIS data will be used to detect fires, to estimate the rate of emission of radiative energy from the fire, and to estimate the fraction of biomass burned in the smoldering phase. The rate of emission of radiative energy is a measure of the rate of combustion of biomass in the fires. In the Smoke, Clouds, and Radiation-Brazil (SCAR-B) experiment the NASA ER-2 aircraft flew the MODIS airborne simulator (MAS) to measure the fire thermal and mid-IR signature with a 50 m spatial resolution. These data are used to observe the thermal properties and sizes of fires in the cerrado grassland and Amazon forests of Brazil and to simulate the performance of the MODIS 1 km resolution fire observations. Although some fires saturated the MAS 3.9 mu m channel, all the fires were well within the MODIS instrument saturation levels. Analysis of MAS data over different ecosystems, shows that the fire size varied from single MAS pixels (50 x 50 m) to over 1 km(2). The 1 x 1 km resolution MODIS instrument can observe only 30-40% of these fires, but the observed fires are responsible for 80 to nearly 100% of the emitted radiative energy and therefore for 80 to 100% of the rate of biomass burning in the region. The rate of emission of radiative energy from the fires correlated very well with the formation of fire burn scars (correlation coefficient = 0.97). This new remotely sensed quantity should be useful in regional estimates of biomass consumption. [References: 15]
机译：计划在1999年和2000年在NASA地球观测系统（EOS）AM-1和EOS PM-1卫星上发射两种中等分辨率成像光谱仪（MODIS）。 MODIS仪器将通过指定的3.9和11微米通道感应火灾，该通道在高温（分别为450和400 K）下会饱和。 MODIS数据将用于检测火灾，估算火灾中辐射能的排放率以及估算在阴燃阶段燃烧的生物质所占的比例。辐射能的发射率是火灾中生物质燃烧率的量度。在“烟雾，云朵和辐射巴西”（SCAR-B）实验中，NASA ER-2飞机飞行了MODIS机载模拟器（MAS），以50 m的空间分辨率测量了火热和中红外特征。这些数据用于观察巴西的塞拉多草原和亚马逊森林的热性质和火灾的大小，并模拟MODIS 1 km分辨率火灾观察的性能。尽管有些大火使MAS 3.9微米通道饱和，但所有大火都在MODIS仪器饱和度范围内。对不同生态系统的MAS数据进行的分析表明，火势大小从单个MAS像素（50 x 50 m）到超过1 km（2）不等。 1 x 1 km分辨率的MODIS仪器只能观察到30％至40％的此类火灾，但是观察到的火灾仅占80％至100％的辐射能，因此占80％至100％的生物质燃烧率。该区域。火灾中辐射能的散发率与火灾中烧伤痕迹的形成非常相关（相关系数= 0.97）。这个新的遥感量应该在生物量消耗的区域估计中有用。 [参考：15]

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