现在的牛打嗝映射;该卫星导致GHGSat ppb的甲烷排放水平的高分辨率的地图吗?他们是怎么做到的?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 07 - 07 - t11:47:09z //www.hoelymoley.com/feeds/question/23784 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/23784 4 现在的牛打嗝映射;该卫星导致GHGSat ppb的甲烷排放水平的高分辨率的地图吗?他们是怎么做到的? uhoh //www.hoelymoley.com/users/6031 2022 - 04 - 30 - t19:33:42z 2022 - 05 - 02 - t11:30:40z < p > CNN的2022年4月30日< a href = " https://edition.cnn.com/2022/04/30/us/cow-burps-methane-space-climate-trnd/index.html " rel = " noreferrer " >牛打嗝的温室气体排放已经开始从太空看到< / >:< / p > < blockquote > < p >排放GHGSat环境数据公司的高分辨率卫星探测到今年2月,根据该公司的新闻发布会上。4月公司的分析证实,排放来自加州的华金河谷牛饲养场。< / p > < p >卫星记录五排放,GHGSat说。If these emissions were sustained for just one year, enough gas would be released "to power 15,402 homes," the company said.

Methane emissions from cattle have been identified as a significant contributor to climate change. As cows digest their food, they release methane, mostly through their gassy burps. But the methane they burp up is a powerful greenhouse gas that traps heat in the atmosphere. The Food and Agriculture Organization (FAO) says that farm cattle contribute to 10% of greenhouse gas emissions worldwide generated by human activity.

And cattle farming is a major industry in California: The state has 650,000 beef cows as of 2019, according to the California Cattlemen's Association.

Brody Wight, the sales director at GHGSat, told CNN this is the first time the company knows of in which scientists were able to use satellite imagery to pinpoint methane emissions from cattle farming. The company has three high-resolution satellites in orbit, which it has previously used to measure emissions from open-pit coal mines. Each satellite is just the size of a microwave oven, says GHGSat.

Question: What are the three high-resolution imaging satellites that GHGSat uses to make high spatial resolution images of methane emission (in this case, likely a cluster of cow burps) and how do these satellites image column-averaged ppb levels of methane above background? What kind of camera and wavelengths are used?

Graphic from the CNN article, showing column-average values of 20 to 100 ppb CH4 with an apparent spatial resolution of roughly tens of meters:

enter image description here

An environmental data company captured images of methane emissions from cattle taken from space.

 //www.hoelymoley.com/questions/23784/-/23785 # 23785 3 回答justCal群牛打嗝了映射;该卫星导致GHGSat ppb的甲烷排放水平的高分辨率的地图吗?他们是怎么做到的? justCal //www.hoelymoley.com/users/6057 2022 - 05 - 01 - t18:17:51z 2022 - 05 - 02 - t11:30:40z < p >快速在线搜索显示了< A href = " https://earth.esa.int/eogateway/missions/ghgsat " rel = " nofollow noreferrer " > GHGSat web页面< / >讨论卫星和他们的能力(我强调):< / p > < blockquote > < p > GHGSat的愿景是成为全球参考遥感温室气体(GHG)的排放从任何来源。没有其他商业或政府卫星的使命是专门为检测和量化温室气体排放点源小作为单独的石油和天然气井。< / p > < p >目前GHGSat星座<强>包含三个卫星< /强>,<强> GHGSat-D (Claire < / em > < em >) < /强>成立于2016年6月,<强> GHGSat-C1虹膜(< em > < / em >) < /强>成立于2020年9月,与<强> GHGSat-C2雨果(< em > < / em >) < /强> 2021年1月推出。< / p > < p >每个卫星都是配备了一个广角法布里-珀罗(WAF-P)成像光谱仪设计测量垂直列中温室气体的总量。<强> GHGSat-D能够测量甲烷和二氧化碳,而GHGSat-C1和GHGSat-C2是甲烷的优化。< /强> < / p > < /引用> < p >仪器进行讨论和程序< a href = " https://earth.esa.int/eogateway/missions/ghgsat: % 7 e:文本=每个% 20 ghgsat % 20卫星% 20携带% 20 % 20专有% 20成像% 20光谱仪% 20 % 20测量% 20设施% 2 dlevel % 20温室% 20气体% 20排放。”rel = " nofollow noreferrer " >在< / >页。< / p > < blockquote > < p >主传感器在所有GHGSat卫星是一个广角法布里-珀罗(WAF-P)成像光谱仪。This primary sensor produces a hypercube consisting of a stack of overlapping, spectrally selected images acquired within <30 seconds. This hypercube embeds, for each ground pixel, information equivalent to hundreds of wavelengths from the top-of-the-atmosphere spectral radiance. Once downloaded, the hypercube is corrected for sensor response and instrument optics. The gas column density and surface reflectance information are then retrieved for each ground pixel using a measurement model which includes surface, instrument and atmospheric contributions to radiance. The resulting arrays are georeferenced, giving the "Surface Reflectance Image" and one "Abundance Dataset" for methane.

GHGSat satellites typically have a spatial resolution of 25 m (>50 m for GHGSat-D) and the Field of View (FOV) of approximately 12 km x 12 km of these datasets allow gas plumes emitted from industrial sources to be captured and distinguished from the surrounding background concentrations, constituting a differential measurement.

The particular details concerning the operating ranges of the spectrometer mentioned are listed as

SWIR 1630-1675 nm, multiple bands in a proprietary configuration, unpolarized

From Celestrak's satcat:

  • GHGSat-D: 2016-040D, 41602
  • GHGSAT-C1: 2020-061G, 46278
  • GHGSAT-C2: 2021-006DA, 47509
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