全球变暖 供水危机(3/3)
概述：气候变化加剧，加州水资源管理者求助美航天局，勘探积雪层融化情况。Hints:
Gehrke
Stanford
Airborne Snow Observatory
photo-reconnaissance
NASA
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口语节目地址：http://bulo.hujiang.com/menu/11921/item/695034/http://t1.g.hjfile.cn/listen/201211/201211180100394645606.mp3California is just one part of a broader picture discussed in the report. Since the state gets little rain in the spring and summer, Gehrke says timing a snowpack melt is critical.
He says he is seeing greater climate variation than ever before. "We're having more extremes in terms of the drought year and then wet year and dry year sort of thing. We see that not only in our record, but also in discussions with a lot of other people who are studying climate."
Gehrke says California water managers need better measurement tools and higher resolution aerial images of the state's snowpack than were available in the Stanford study. For that, the state has turned to the U.S. space agency's Airborne Snow Observatory.
Flying at altitudes of about 7,000 meters, the photo-reconnaissance aircraft captured detailed images of mountain snowpack over a wide area.
The NASA flights will also measure how much sun is reflected from the snowpack, which can indicate how fast it is likely to melt.加利福尼亚正是报告中所讨论的更广泛构想的一部分。因为在春秋两季，加州几乎不下雨。格尔克表示，掌握积雪融化的时机是关键。
他正注意到气候变化比以往任何时候都大。“就我们所经历的诸如干旱洪涝灾害交替出现，我们正经历更多极端的气候。这不但可以从我们的记录中发现，还可以从与很多致力于气候研究的人的讨论中发现。”
格尔克表示，比起斯坦福大学研究报告中所说的可用工具和分辨率，加利福尼亚水管理者需要更好的测量工具和更高的加州积雪鸟瞰图分辨率。正因为如此，加州转而求助美国航天机构的机载观雪天文台。
飞行在海拔约7000米的高度，空中拍照观测机捕捉了覆盖大范围雪山积雪的精密图像。
美国国家航空航天局还测量多少阳光遇积雪反射回来，这能预示积雪可能多快融化。
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