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O*********r
发帖数: 1835 | 2 28% of clouds are precipitating are based on new CloudSat data, whose 3-mm
radar is more sensitive to drizzle than traditional meteorological radar.
It's one of the "surprises" GLS is claiming that CloudSat brings about. It
really depends on how one defines the word precipitation. BTW, I think GLS
means 28% of tropical clouds, not global average. Many of the stratocu are
actually drizzling.
GLS is a very skillful speaker. He first uses his rumbling Australian
accent to attract audience (i |
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j*******w
发帖数: 3 | 3 cloudsat is sensitive to small particles，but can't measure reflectivity
greater than 20dbZ. Very strong storms have a reflectivity greater than
50dbZ, so I don't know how effective to use cloudsat to track hurricane?
TRUTH |
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p********t
发帖数: 1219 | 4 VANDENBERG AIR FORCE BASE, CA, United States (UPI) -- NASA canceled the launch
of two satellites Tuesday because of unsatisfactory weather conditions in
west-central California.
The scheduled launch of CloudSat and CALIPSO -- Cloud-Aerosol Lidar and
Infrared Pathfinder Satellite Observations -- from Vandenberg Air Force Base,
Calif., was scrubbed shortly before 6 a.m., EDT, due to higher than allowable
upper level wind conditions.
The next launch attempt is tentatively set Wednesday at 6:02 a.m. |
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p********t
发帖数: 1219 | 8 Washington - The US space agency Nasa postponed the launch of two satellites,
designed to help unlock the secrets of Earth's cloud cover, due to technical
problems, officials said early Thursday.
The CloudSat and CALIPSO satellites were scheduled to blast off at 10h02 GMT
Thursday from Vandenberg Air Force Base in California, but the launch has been
delayed for at least 24 hours, Nasa announced.
"The scrub is due to a suspect nitrogen temperature sensor on the rocket's
second stage that may requ |
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O*********r
发帖数: 1835 | 9 版主是识货之人。
这张IMAGE看似平凡，实则是卫星遥感的一个重要进展，和97年上天的TRMM联袂，再
加上另外一些passive sensors，就把atmospheric remote sensing做活了。怎么讲
呢？这个CloudSat的PI， GLS，本来是个radiation guy，专做atmospheric radiation的
理论和运用。虽靠做RADIATION名气已很大，但一直没有跳出单纯的remote sensing这
个框框。但80年以来代兴起的Climate Change研究，以及Global Warming辩论的政
治化，创造了一个新的机遇，为纯遥感的同修们开启了一扇新门。于是相当一部分
radiation people(包括planetary scientist)将专长发挥到Climate Change研究上。
带头大哥包括NASA/GISS的JIM HANSEN。GLS是后起。好象上面那张RADAR SCAN OF
CLOUDS，据说是饱藏了揭开Global Warming奥秘的金钥匙。原因很简单，Cloud
Feedback是
未来Global Wa |
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h****j
发帖数: 80 | 10 I don't agree that cloudsat works similarly as medical CT. The radar scans
each column of atmosphere one time. While in medical CT, they rotate the X-
ray tube around the patient (therefore many measurements are made).
Theorectically, to fully reconstruct the 3D field (human tissue or cloud)
requires the infinite number of sources and detectors. In order to invert
vertical profile of clouds, GLS makes many assumptions on the clouds (Austin
& Stephens, 2001). Some of them are not realistic. It is |
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O*********r
发帖数: 1835 | 11 版主是识货之人。
这张IMAGE看似平凡，实则是卫星遥感的一个重要进展，和97年上天的TRMM联袂，再
加上另外一些passive sensors，就把atmospheric remote sensing做活了。怎么讲
呢？这个CloudSat的PI， GLS，本来是个radiation guy，专做atmospheric radiation的
理论和运用。虽靠做RADIATION名气已很大，但一直没有跳出单纯的remote sensing这
个框框。但80年以来代兴起的Climate Change研究，以及Global Warming辩论的政
治化，创造了一个新的机遇，为纯遥感的同修们开启了一扇新门。于是相当一部分
radiation people(包括planetary scientist)将专长发挥到Climate Change研究上。
带头大哥包括NASA/GISS的JIM HANSEN。GLS是后起。好象上面那张RADAR SCAN OF
CLOUDS，据说是饱藏了揭开Global Warming奥秘的金钥匙。原因很简单，Cloud
Feedback是
未来Global Wa |
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O*********r
发帖数: 1835 | 12 版主是识货之人。
这张IMAGE看似平凡，实则是卫星遥感的一个重要进展，和97年上天的TRMM联袂，再
加上另外一些passive sensors，就把atmospheric remote sensing做活了。怎么讲
呢？这个CloudSat的PI， GLS，本来是个radiation guy，专做atmospheric radiation的
理论和运用。虽靠做RADIATION名气已很大，但一直没有跳出单纯的remote sensing这
个框框。但80年以来代兴起的Climate Change研究，以及Global Warming辩论的政
治化，创造了一个新的机遇，为纯遥感的同修们开启了一扇新门。于是相当一部分
radiation people(包括planetary scientist)将专长发挥到Climate Change研究上。
带头大哥包括NASA/GISS的JIM HANSEN。GLS是后起。好象上面那张RADAR SCAN OF
CLOUDS，据说是饱藏了揭开Global Warming奥秘的金钥匙。原因很简单，Cloud
Feedback是
未来Global Wa |
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p********t
发帖数: 1219 | 13 Good. 据说Cloudsat非常成功，仪器设计指标基本上都达到了。
在IGARSS看到了很多cloud profile，真的很fancy. |
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r****y
发帖数: 1437 | 14 You are at cloudsat meeting now?
number |
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O*********r
发帖数: 1835 | 15 不要讲成这样，我是混口饭吃。老实讲，我要坐类似你现在的位子，就不用在这里卖
命了。GLS需要NASA明年三月给他RENEW CLOUDSAT(就像TRMM一样，延来延去飞了快
十年)，所以最近几个月很关键。
大家多灌水，我TAKE几个月的LEAVE先。 |
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O*********r
发帖数: 1835 | 16 我个人看法正好相反。之前也是存“投机”心态，斗胆在毫无背景的情况下一头扎进
HURRICANE RESEARCH。没想到这一行混饭的太多了，以至个个心态有问题。我一篇
自认不错，又有GLS和KE首肯的PAPER，竟刚被REJECT，理由是BEST TRACK不是GROUND
TRUTH，所以我们的结果跟BEST TRACK比好与不好都不能说明问题。REVIEWER竟建议
对每个CLOUDSAT的HURRICANE OVERPASS，我们应该飞一架飞机去COLLECT GROUND TRUTH
。GLS大怒，却也无计可施，只好改投别的了。
总之做台风是热门，特别是KATRINA以后，但僧多粥少，不容易。特别是像我这样半
路出家的，总受“歧视”。看来还是钉死自己看家本事来ESTABLISH自己的领域方为正
道。 |
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G*******s
发帖数: 76 | 17 Ke 是Emanuel? GLS是谁啊？
有拿Cloudsat根据模式识别自动提取台风半径的么？手工也太太那什么了吧
个， |
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