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G W

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Mee

ting

2005

Comparison of modelled variation in water storage in Finland with GRACE and

superconducting gravimeter observations

CPC – Climate Prediction Centre global soil moisture data set

WSFS – Watershed Simulation and Forcasting System Finland

Superconducting gravimeter time series

GRACE time series

Finnish Geodetic InstituteH. Virtanen, M. Bilker, J. Mäkinen, M. Poutanen, M. Tervo

Finnish Environment InstituteB. Vehviläinen, M. Huttunen, R. Mäkinen

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Mee

ting

2005

CPC vs. WSFS

’96 ’98 ’04’02’00

WSFS CPClinear regression coefficient 1.23

NK

G W

GG

Mee

ting

2005

Merging CPC & WSFS

Loading effect after insertion 4.2 nms-2 smaller

NK

G W

GG

Mee

ting

2005

Monthly averages

SG

SGGW corr.

Precip.

Water eq.Snow

Totalwater

Groundwater

NK

G W

GG

Mee

ting

2005

Stacked monthly values

NK

G W

GG

Mee

ting

2005

Regression

GW WSFS PREC SNOW CORR

26.9       0.970

16.5 0.099     0.982

27.7   0.029   0.971

24.7     0.065 0.975

25.8   0.047 0.072 0.976

16.9 0.114 0.075 -0.000 0.985

17.0 0.113 0.075   0.985

16.4 0.100   -0.001 0.982

NK

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GG

Mee

ting

2005

Water models & GRACE

-200

-150

-100

-50

0

50

100

150

200

06.03

07.03

08.03

09.03

10.03

11.03

12.03

01.04

02.04

03.04

04.04

05.04

06.04

07.04

08.04

Date

mm

-8

-6

-4

-2

0

2

4

6

8

µgal

CPC WSFS

GRACE (L = 50) GRACE moving average