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* SchmidtGA_JGR_2005a [#p933eef5]
G.A. Schmidt, G.Hoffmann, D.T.Shindell, and Y.Hu, Modeling atmospheric stable water isotopes and the potential for constraining cloud processes and stratosphere-troposphere water exchange, JGR, 110, D21314, doi:10.1029/2005JD005790, 2005.

- Category: Upperair Isotopes
- Tool(s): GCM
- Summary: GISS-Eに同位体を組み込んだ後のはじめての論文。GNIPと比較するだけでなく、特に対流圏界面・成層圏の水蒸気の再現性に詳しく突っ込んでいる。同位体GCMを作りました論文のハードルが高くなってる…。
- Read Date: 2006-08-08

** Messages [#d42cb563]
- GISS-Eに同位体を組み込んだ後のはじめての論文。GNIPと比較するだけでなく、特に対流圏界面・成層圏の水蒸気の再現性に詳しく突っ込んでいる。同位体GCMを作りました論文のハードルが高くなってる…。
- 雨同位体比の分布を再現するのは至って簡単。逆に言うと、上層の大気過程を解明するツールとはなり得ない。
- 上層の大気過程にSensitiveなのは、(上層の)水蒸気。
-- 成層圏由来:重い水(メタン起源≒−70‰(D)、酸素起源≒23‰(18O))
-- 対流圏由来の軽い水が良く分からない。大きく変動する。今のモデルも、過小評価。([[Gettelman et al, 2005>study/GettelmanA_JGR_2005a]]でもそうだった。鉛直一次元Rayleighよりはマシ。)
- 改善点として挙げられているのは以下の二点。
-- 鉛直の高解像度化
-- 動的分別に関する係数の精緻化

** Details [#c4fafe58]
- Entrainmentを0%から10%に増やす(ENT10)と、対流圏界面が下がり、同位体の極小域が下がる。
- CRYSTAL-FACEのような、極端に幅の広い変動は再現できていない。
- 過飽和に関する同位体parameterization(SUPSAT)が効く(効いてしまう)。(S=1-0.003*T→1-0.004*T)
- Cappa et al, 2003の動的分別係数(CAPPA)は、全体のd-excessを3‰高める。しかし、改良にはならない。
- 雲水か雲氷か、が数値計算上結構重要。全部氷にしてしまえば楽。
- 雲水・雲氷は水平移動しない。(Convectionの中では移動しているっぽい。)
** Question [#q044c337]
** Memo [#m44e4097]
- 成層圏と対流圏の混合に、Keeling Plotが使えるのが面白い。

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#comment