Terms and Conditions for using 20th Century Isotope Reanalysis (IsoGSM20C)

A user must agree to following terms and conditions before usage.

20th Century Isotope Reanalysis data (IsoGSM20C hereafter; main reference is Yoshimura, 2015) are IsoGSM (Yoshimura et al., 2008) simulation for 1871-2010 which is nudged toward 20C Reanalysis (Compo et al., 2011) with the global spectral nudging (Yoshimura and Kanamitsu, 2008) and the incremental correction for ensemble product (Yoshimura and Kanamitsu, 2013). IsoGSM20C is made freely available to the public and the scientific community in the belief that their wide dissemination will lead to greater understanding and new scientific insights. The availability of IsoGSM20C data does not constitute publication of the data. We rely on the ethics and integrity of the user to assure that Kei Yoshimura (KY hereafter) receives fair credit for our work. If IsoGSM20C data are obtained for potential use in a publication or presentation, KY should be informed at the outset of the nature of this work. If IsoGSM20C data are essential to the work, or if an important result or conclusion depends on the data, co-authorship may be appropriate. This should be discussed at an early stage in the work. Manuscripts using IsoGSM20C data should be sent to KY for review before they are submitted for publication so that it can be insured that the quality and limitations of IsoGSM20C data are accurately represented.

Format for time sequence data (monthly for 1871-2010).

file location: tmp/isogsm20c/monthly/xXXXyYYY_ensda_monthly.dat
(XXX:001-192, YYY:001-094)

Lon= (longitude) Lat= (latitude)
 1 PWAT: precipitable water (mm)
 2 PWAT18O: 18o for PWAT (mm/SMOW)
 3 PWATHDO: hdo for PWAT (mm/SMOW)
 4 PRATE: total precipitation (kg/m2/s)
 5 PRATE18O: 18o for PRATE (kg/m2/s/SMOW)
 6 PRATEHDO: hdo for PRATE (kg/m2/s/SMOW)
 7 CPRAT: convective precipitation (kg/m2/s)
 8 CPRAT18O: 18o for CPRAT (kg/m2/s/SMOW)
 9 CPRATHDO: hdo for CPRAT (kg/m2/s/SMOW)
10 LHTFL: latent heat flux (W/m2)
11 LHTFL18O: 18o for LHTFL (W/m2/SMOW)
12 LHTFLHDO: hdo for LHTFL (W/m2/SMOW)
13 SPFH2m: 2m specific humidity (kg/kg)
14 SPFH2m18O: 18o for SPFH2m (kg/kg/SMOW)
15 SPFH2mHDO: hdo for SPFH2m (kg/kg/SMOW)
16 TMP2m: 2m air temperature (K)
17 RH2m: 2m relative humidity (%)
18 PRESsfc: Surface pressure (Pa)
19 HGT500: 500hPa geopotential height (m)

where SMOW=[H18O]/[H2O] or [HDO]/[H2O] in Standard Mean Ocean Water.
To calculate delta18o in precipitation, do followings:
delta18O_p[permil]=(PRATE18O/PRATE-1)*1000

The rows indicate as follows:
- For all instantaneous variables except HGT500 (i.e., PWAT, SPFH2m, TMP2m, RH2m, PRESsfc and associated isotopes), it starts from 6Z1Jan and ends with 0Z1Jan.
- For all flux variables (i.e., PRATE, CPRAT, LHTFL and associated isotopes), it starts from average of 0Z-6Z1Jan and ends with 18Z31Dec-0Z1Jan.
- HGT500 starts from 0Z1Jan and ends with 18Z31Dec.

References:
(Main Reference) Yoshimura, K., 2015: Stable water isotopes in climatology, meteorology, and hydrology: A review. J. Meteor. Soc. Japan, 93, doi:10.2151/jmsj.2015-036.
Yoshimura, K. and M. Kanamitsu, 2008: Dynamical global downscaling of global reanalysis, Mon. Wea. Rev., 136, 8, 2983-2998.
Yoshimura, K., M. Kanamitsu, D. Noone, and T. Oki, 2008: Historical isotope simulation using Reanalysis atmospheric data, J. Geophys. Res., 113, D19108, doi:1029.10/2008JD010074.
Compo, G. P., and Coauthors, 2011: The Twentieth Century Re- analysis Project. Quart. J. Roy. Meteor. Soc., 137, 1–28, doi:10.1002/qj.776.
Yoshimura, K. and M. Kanamitsu, 2013: Incremental correction for the dynamical downscaling of ensemble mean atmospheric fields, Mon. Wea. Rev., 141, 3087–3101, doi:10.1175/MWR-D-12-00271.1.