RCM2009 †

Plan to participate RCM2009 http://www.baltex-research.eu/RCM2009/ for 4-8 May.

9:00 Prof Per Eriksson (Lund University)

  • Lund U was founded in 1666.

9:10 Bengt Holgersson (Swedish government commission on climate and vulnerability)

9:20 Rupa Kumar Kolli (WMO)

Session1 (chaired by Burkhardt Rockel)

9:30 Frauke Feser (GKSS): Added value by RCM

  • 女性でした。
  • Winterfeldt and Weisse, MWR 2009
  • only coastal region, we can see added value. Not open ocean.
  • Spatial resolution threshold for added value?
  • double nesting is necessary for typhoon simulation

9:50 Rene Laprise (UQAM)

  • 男性でした。
  • internal variability increases as domain size enlarges
  • inperfect big-brother: checking whether RCM can improve LS.
  • remaining issues:
    • spatial spin-up (200x200: 50km)

10:15 Katarina Veljovic (Univ. Belgrade)

  • Storm track: ECMWF is better than RCMs!

11:00 Myself

  • Reason of overestimation of precipitation (or signs of error)? (A. Will)
    • Due to spurious divergence.
  • Extrapolation to stratosphere (R. Laprise)
    • better than simple way. (but no information at all)

11:20 H.S. Kang (Yonsei)

  • NCEP RSM
  • Internal variability?
  • Sensitivity of Parameterizations

11:40 J. Tang (Nanjing U)

  • MM5 (nonhydro, KF2) Spectral nudging, 50km
  • 1991 Summer in China (flood)
  • Someone is sticking to ask about climate simulation downscaling.
  • By Hans; The difference in observation and RCM simulation: is this error from the model or something else?

12:00 K. Dairaku

  • Slight change in precipitation makes significant impact in river discharge.

12:20 Martin Suklitsch (U. Graz)

  • NHCM-1, 10km
  • COSMO-CLM ver4.0
  • Alps up to 1km
  • added value
    • no in bias and diurnal pattern
    • some in pattern
  • effective resolution: 3-5*dx.

14:00 Kanamitsu (Yoshimura)

  • No comment :(

14:20 Rosmeri da Rocha

14:45 A. Alexandru (Canada)

  • 女性でした
  • SN reduces IV.
  • ちょっと効きすぎ？？ Their "full nudging" is 100% replacing of waves!

15:05 M. Zahn (GKSS)--> Very nice.

  • Polar lows
  • detection algorithm
    • filtered mslp < -1 hPa
  • strong IV.

17:00 A. Gobiet (Wegener Center)--> comprehensive.

  • 10km downscaling from ERA40 -> 4 models, 57 runs.
  • 15% error from models, set-up (incl. nudging, domain)
  • 50% error from parameterization (mostly from WRF)

17:25 Christopher Castro (U. AZ)

  • Dynamical downscaling types
    • IC are forgotten -> type 2 and above
  • Castro 2005 + spectral nudging
  • Q: short period -> robust for long period, probably.
  • Q: conservation (?)

17:50 Martin Leduc (Canada)

  • Little/Big brother experiments
  • transient eddies
  • spectral nudging
    • Full SN: completely replacing waves -> why possible?

18:10 Erasmo Buonomo (Met Office)

  • scale separation
    • 2D digital filter (Feser and von Storch, 2005)
  • Discrete cosine transform (DCT) filter Denis et al., 2002

18:30 Discussion

  • What evidence do we need to declare a model "wrong"?
  • What is the utility of case studies?
  • What added value are "we" after?
  • For what purpose do we need higher resolution?
  • What is the utility of applying large scale constraints?
  • How do we determine the utility of large-scale constrained GCM-driven RCM simulations?

総括：

  • German vs Canadianですねー。Scrippsは人手が足らん。
  • Spectral nudging 大流行。
category:Meeting author: kei at 2009-03-09 (Mon) 07:55:33
  • Spectral nudgingって，波長の長い成分だけGCMの結果にナッジングする感じですか？ それだと側面境界を与える（というか事実上境界付近だけ全成分GCMにナッジングする） より意味が明確かも．しかし空間差分を使ったモデルだと実装が難しい気がします． -- Souma at Hawaii? 2009-05-10 (Sun) 17:44:52
  • コメントに今気づいた。すまんね。そう、空間的に波長の長い成分のナッジング。グリッドモデルでも波数展開して実装している模様（CRCM、WRFとか）。ただ、彼らは側方境界も残したままやってるっぽい。 -- kei 2009-05-12 (Tue) 09:07:58
  • おいそがしいところお相手いただきありがとうございます．やっぱりNCARとか「プログラミングが専門だけれどサイエンス（気象・気候）も一通りわかる人」と「バリバリ研究者で新しいスキームの概念を作るとかしたいけど，実装の仕方もある程度はしっている」タイプの人達がいて，チームを組んで取り組めるんでしょうね．分担と協力をしっかりマネジメントできれば，WRFとか巨大なシステムを生み出し，改良していくことができるんでしょうね． -- 2009-05-14 (Thu) 07:16:49

#comment2_kcaptcha