BASIN Meeting
2005/12/04 @Marriott
- Alexander Knohl
- Vaporのd18Oの長期変化(Israel)
- 1年のデータがそろった。→公開はどのように?(Riley)
- Vaporのサンプリングはどこのレベルで?高さ方向にどのように変わる?について少し議論。
- Ulli Seibt
- ScotlandのLeaf Water d18O。
- 夜の呼吸のd18OがSteady State仮定とNon-steadyでかなり異なってしまう(変動が反転する)
- 気孔がひらくことによる、水蒸気とCO2とかの交換を考えなければいけない?
- Nate McDowell
- KeelingPlotでEvaporativeFluxのd18Oをプロットすると、重くなり続ける。(外気の影響?)
- Chris Still
- Bill、Davidとコラボ。
- τ(TurnOverPeriod=V/gw)=0がSteady State.つまりLeaf
WaterのVolumeを十分小さいとした場合。
- τ=3hrとかで、Non Steady StateでのLeafWater d18OをあくまでDiagnosticに求める。
- IsoFlux(mol/m2/s・‰など;‰はRelativeではない)で議論。
- d18O in ground CO2にSensitive
- Break
- 環境研の高橋さんにCO2の18O、13Cについてお話を聞く。道のりは長そうだ。(13Cの分別要因は、水よりももっとややこしい)
- C系とH20系でもっとコラボすると、観測が半分ですむかも。違うな、2倍になるかもだ。
- ??
- 豆プロテインと雨のδDが相関。
- さまざまなグローバル気候値からセルロースのd18Oの分布を求める。→それで?
- Diane Pataki (Wrap Up)
- How important is LWC and how can it be estimated?
- How large is the pool size and how can it be estimated?
- How important si nighttime gs?
- How vanable is turnover time spatially and temporally?
- How is important is the lower canapy?
- Fractionation factors:
- equilibrium: temperature effect
- kinetic: humidity effects
- relative role of boundary layer
- How important in entrainment vs NSS in understanding canopy
water vapor?
- How important is NSS in interpreting cellulose? alkanes?
- At what spatial and temporal scale is NSS important?
- Water vapor or 18O isoflux at weekly or greater time scales?
- When canopy water volume is large relative to atm. pools?
- For modeling precipitation?
- For nighttime d18O in CO2? How important is NSS vs two way
fluxes?
- Biomass?
- What additional data/modeling is needed?
- MIBA network
- remote sensing products/modeling of LWC
- soils: does stedy state modeling apply?
- TDL of water vapor and 18O of CO2
- more plant functional typer and biomes
- model/data comparisons
- other isotpic proxicies
- common terminology
- analysis of tree ring data- compare with climate models
- compound specific analyses
- Next issues?
- Tropical tree rings
- Other tracer gases (NOx, CH4, etc.)
- Funding?
- Participants
- Carol Kendall, Jeff McDonnel, etc. as hydrologists
- Agriculture
- Paleo