[Liwg-core] co-chairs notes 1-3-17

Kampenhout, L. van (Leo) L.vanKampenhout at uu.nl
Wed Jan 4 07:03:46 MST 2017


Hi all,

below some numbers for run 119, 124 and 125.
RACMO2.3 estimates SNOW = 673 +/- 77, so with the repartitioning we’re still on the high side with about 100 Gt.
For the period 1961-1990 RACMO predicts SMB = 398 +/-112 so runoff is still underestimated with about ~200 Gt  (700-100-398)
77% of rain is refrozen in run 119, 83% in run 124 and 79% in run 125 so it’s a long shot to conclude that the new repartitioning has a significant effect?

Best,
Leo


Greenland






Case    Integration mask        RAIN    RAIN_REP        SNOW    SNOW_REP        QICE
b.e15.B1850.f09_g16.pi_control.all.119
period = 0080-0104
        CESM16  203.145 Gt
        37.1817 Gt
        628.17 Gt
        794.134 Gt
        666.51 Gt


        RACMO2.3        230.934 Gt
        52.1988 Gt
        672.709 Gt
        851.444 Gt
        719.824 Gt

b.e20.B1850.f09_g16.pi_control.all.124
period = 0005-0024
        CESM16
        167.039 Gt
        22.8908 Gt
        564.673 Gt
        708.821 Gt
        604.017 Gt


        RACMO2.3
        187.502 Gt
        31.5097 Gt
        604.201 Gt
        760.192 Gt
        637.48 Gt

b.e20.B1850.f09_g16.pi_control.all.125
period = 0032-0051
        CESM16
        150.234 Gt
        24.8538 Gt
        619.013 Gt
        744.393 Gt
        660.788 Gt


        RACMO2.3
        172.677 Gt
        36.3906 Gt
        664.011 Gt
        800.298 Gt
        696.981 Gt




On 03 Jan 2017, at 20:32, Lenaerts, J.T.M. (Jan) <j.lenaerts at uu.nl<mailto:j.lenaerts at uu.nl>> wrote:

Hi all,

Happy New Year everyone!

We will need to check the ice sheet SMB numbers in 125. I am back in the office next week and I will produce some plots.

Cheers,

Jan


________________________________________
From: Liwg-core [liwg-core-bounces at cgd.ucar.edu<mailto:liwg-core-bounces at cgd.ucar.edu>] on behalf of Bill Sacks [sacks at ucar.edu<mailto:sacks at ucar.edu>]
Sent: Tuesday, January 03, 2017 8:05 PM
To: Marcus Löfverström
Cc: liwg-core at cgd.ucar.edu<mailto:liwg-core at cgd.ucar.edu>
Subject: Re: [Liwg-core] co-chairs notes 1-3-17

No, I just mean changing the simple rain-snow partitioning scheme to use a different ramp – currently:

   ! ramp near freezing
   frac_rain = (temperature - SHR_CONST_TKFRZ) * 0.5_r8

   ! bound in [0,1]
   frac_rain = min(1.0_r8,max(0.0_r8,frac_rain))

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