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

Bill Sacks sacks at ucar.edu
Wed Jan 4 09:04:47 MST 2017


Hi Leo,

Thank you very much for these numbers.

I am a little confused, though: You refer to the effect of the new repartitioning, but I thought that we have only included the new repartitioning in runs that you and Jan did – not in any of Cecile's runs. Am I remembering wrong, and do some of the runs below actually have this new repartitioning?

Thanks,
Bill S

> On Jan 4, 2017, at 7:03 AM, Kampenhout, L. van (Leo) <L.vanKampenhout at uu.nl> wrote:
> 
> 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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