DGVM and LSM

很高兴在这个时刻读到了Anne Quillet的综述文章。
1. The modules representing the interactions between biosphere and climate in GCM are SVAT.
Until 1980, land surface parameterizations were introduced in GCM computations. However, all the SVAT are static and didn't include dynamical component of vegetation.
SVAT is a scheme developed specially for GCM.
But DGVM can be directly coupled to GCM.

关于数据，观测手段等文章，一直觉得没有兴趣去了解。我觉得必须要有硬性的标准，像上课一样。

泪流以后是坚持

无聊中打开油管首页推荐的李健在央视《夜话》的访谈。

大学的时候我对李健已经很了解了。对我来言他不是一种现象，而是一种音乐习惯，习惯了人淡如菊的他，习惯有他那种宁静隽永的力量注入生活。是以，我其实很少对李健的人生，乃至我自己的人生做过刻意的思考。

没想到，在节目中间，李健的高中、清华同学高鹏说了一番话，把我触动了。高鹏曾是清华合唱团团长，目前是金融家，在外人眼里有着非常体面的生活和工作。他和李健有着完全相似的校园轨迹，却有着完全不同的人生轨迹。

我能完全理解这种表面的相似，主要是校园里选择相对局限的这种客观因素造成的。无论升学、保研、出国、找工作，高中大学校园里最重要的社会衡量标准，无非还是高考成绩、绩点、寄托成绩和文章数量此类。然而清华北大里，哪个人不是三头六臂，才艺加身，远的不说吧，我的三位室友就分别会弹古筝，拉小提琴，弹钢琴。可是仔细想想，有多少人是出自真心对艺术的喜爱，出自和李健相似的对音乐的痴迷。如今坚持音乐理想的人凤毛麟角，在李健那个年代（2000）还算正常，但在今天，却显得那么的不合时宜。

[Review] Surface energy fluxes

Surface energy fluxes are the exchanges of energy, water and other atmospheric constituents on the surface, such as water molecule.

Surface energy fluxes mainly occur in the form of radiant energy, latent heat, sensible heat, and soil heat. The residue term of the heat fluxes is the heat that diffuses into the ground and be stored. The heat storage include physical energy storage, biochemical energy storage (2% of the incoming solar energy, which is amazingly small) , and the advected energy (which is important at the heterogeneous surface, such as oasis).

Some typical numbers (w/m2),

Downward shortwave radiation, 350

Longwave net radiation, Nighttime net radiation, -75

Terrestrial surfaces with different land cover types substantially alter the amount of the solar radiation. And the partitioning into latent and sensible heat changes from day to night.

(1) From albedo perspective:

dark color and rougher surface reflects less solar radiation, so therefore higher net radiation. Forest, wet soil have higher incoming energy.

(2) From partitioning in latent and sensible heat perspective: 

(a) For soil, wet soil is latent heat dominant, while dry soil is sensible heat dominant. 

(b) For forest, latent heat is slightly greater than sensible heat.

(c) For crop, latent heat is dominant. Why no sensible heat?

(3) From daytime and nighttime perspective: 

Wet soil have better thermal conductivity and store more heat at night.