Dataset: Making Sense of SMOS Soil Moisture Observations over Norway and Northern Areas, 2012

Abstract

This project concerned studies to make more sense of the European Space Agency, ESA, SMOS (Soil Moisture and Ocean Salinity) soil moisture observations over Norway and Northern Areas. The SMOS satellite was launched in 2009 and is still working, providing data with relatively coarse spatial resolution (~43 km footprint), a limited instantaneous field of view (~1000 km across) and relatively infrequent revisits (1-3 days). The project used data assimilation ideas to improve the spatial and temporal information provided by SMOS to be more in line with user needs, i.e., offer higher rate, higher resolution, wider area “snap shot” information. For the data assimilation we used a variant of the Ensemble Kalman Filter (EnKF). The enhanced spatial resolution varied between 4 and 9 km (depending on model resolution) and the enhanced temporal resolution typically was 6 hours (the time step to update the analysis using SMOS data). As part of this study, the project evaluated the quality of satellite soil moisture observations and land surface model simulations over Norway, and assessed the NILU land data assimilation system in the context of studies of the hydrological cycle over land. This study addressed the challenge of using SMOS data to understand the hydrological cycle in Norway and Northern Areas, regions characterized by complex orography.  

For access to the dataset, use the NSD application form:  

http://www.nsd.uib.no/nsd/english/orderform.html

Variable Groups

Full Title

Making Sense of SMOS Soil Moisture Observations over Norway and Northern Areas, 2012

Identification Number

NSD2290

Authoring Entity

Name Affiliation
Lahoz, William Norwegian Institute of Air Research

Producer

Name Affiliation Abbreviation Role
Lahoz, William Norwegian Institute of Air Research NILU Principal Investigator

Copyright

Copyright (C) 2012 William Lahoz, Norwegian Institute of Air Research

Funding Agency/Sponsor

Name Abbreviation Role Grant
The Research Council of Norway RCN 202315
Norwegian Institute of Air Research NILU

Data Distributor

Name Affiliation Abbreviation
Norwegian Social Science Data Services NSD

Version

Date: 2016-02-19

Notes

Original data from William Lahoz, Norwegian Institute for Air Research are documented and prepared, first NSD-version.

Bibliographic Citation

"Making Sense of SMOS Soil Moisture Observations over Norway and Northern Areas, 2012". Data collected by William Lahoz, Norwegian Institute of Air Research. First NSD edition, Bergen 2016.

List of Keywords

Topic Classification

Time Period Covered

Start End Cycle
2010 2015

Date of Collection

Start End Cycle
2010-01-01 2012-12-31
2011-07-01 2011-07-31
2012-07-01 2012-07-31

Country

Norway  (NO)

Geographic Coverage

Country

Geographic Unit

Norway and Northern areas.

Unit of Analysis

Geographic unit

Universe

In situ/satellite soil moisture comparison:
Time series of soil moisture at the locations of six NVE stations (Kise, Kvithamar, Særheim, Værnes, Øverbygd, Ås), units of m3/m3 (cubic metre per cubic metre) of:

(i) in situ data
(ii) SMOS data
(iii) AMSR-E data
(iv) ASCAT data
  
Location of NVE stations, north to south in Norway:

Øverbygd 69.02oN 19.35oE 83 masl
Kvithamar 63.49oN 10.88oE 70 masl
Værnes 63.45oN 10.97oE 90 masl
Kise  60.77oN 10.81oE 130 masl
Ås 59.66oN 10.77oE 80 masl
Særheim 58.76oN 5.65oE 90 masl

Soil moisture analyses for Europe:  
Latitude-longitude maps of superficial soil moisture (units of m3/m3) over the Norway domain, including Norway, Northern Denmark, Sweden and Western Finland. Spatial resolution is 5 km. The analyses are constructed by assimilation soil moisture data from the SMOS satellite into the SURFEX land surface model. The assimilation method is a variant of the Ensemble Kalman Filter, EnKF.

We also include maps of similar soil moisture analyses from the free model run (i.e., without assimilation).

Kind of Data

Other

Time Method

Time series

Data Collector

Lahoz, William, Norwegian Institute for Air Research  (NILU)

Sampling Procedure

(i) Receipt of data from 6 NVE stations, and the SMOS, AMSR-E and ASCAT data repositories (TOVE: PLEASE IDENTIFY);
(ii) Identification of SMOS, AMSR-E and ASCAT nearest pixel to NVE stations;
(iii) Streaming SMOS, AMSR-E and ASCAT data according to orbit (descending/ascending)

Mode of Data Collection

Other measurements

Location

Availability Status

NSD can make data from "Making Sense of SMOS Soil Moisture Observations over Norway and Northern Areas, 2012" available after 31.12.2017. After this date, the data will be available for research, teaching and students when ordered.

Extent of Collection

10 data file(s); different formats can be made.

Restrictions

NSD can make data from ”Making Sense of SMOS Soil Moisture Observations over Norway and Northern Areas, 2012” available after 31.12.2017. After this date, the data will be available for research, teaching and students when ordered.

Citation Requirement

Users are obliged to refer to producer and distributor of the data by writing the following in forewords or footnotes in eventual publications:
"(Some of) the data applied in the analysis in this publication are based on "Making Sense of SMOS Soil Moisture Observations over Norway and Northern Areas, 2012". The survey was financed by The Reasearch Council of Norway. The data are provided by William Lahoz, The Norwegian Institute for Air Research and prepared and made available by the Norwegian Social Science Data Services (NSD). Neither William Lahoz, The Norwegian Institute for Air Research, The Research Council of Norway nor NSD are responsible for the analysis/interpretation of the data presented here.

Deposit Requirement

Access to data is given on the condition that NSD gets a PDF-file of eventual reports that are written on the basis of the data. This to ensure best possible information of the use of data we distribute.

Conditions

The order form has to include name, institutional affiliation, project title, information about sources of financing and postal address. A declaration of secrecy has to be signed before delivery of data.

Disclaimer

Neither William Lahoz, The Norwegian Institute for Air Research, The Research Council of Norway nor NSD are responsible for the analysis/interpretation of the data presented here.

Related Publications

Closing the Gaps in our Knowledge of the Hydrological Cycle over Land: Conceptual Problems

Lahoz, W.A., and G.J.M. De Lannoy (2014) Closing the Gaps in our Knowledge of the Hydrological Cycle over Land: Conceptual Problems. Surveys in Geophysics, 35, s. 623-660.

Evaluation of Satellite Soil Moisture Products over Norway using Ground-Based Observations

Griesfeller, A., W.A. Lahoz, R.A.M. de Jeu, W. Dorigo, L.E. Haugen, T.M. Svendby, and W. Wagner (2015) Evaluation of Satellite Soil Moisture Products over Norway using Ground-Based Observations i International Journal of Applied Earth Observation and Geoinformation..

Corrigendum to: Evaluation of Satellite Soil Moisture Products over Norway using Ground-Based Observations

Griesfeller, A., W.A. Lahoz, R.A.M. de Jeu, W. Dorigo, L.E. Haugen, T.M. Svendby, and W. Wagner (2016) Corrigendum to: Evaluation of satellite soil moisture products over Norway using ground-based observations i International Journal of Applied Earth Observation and Geoinformation.

Implications of the Form of the Ensemble Transformation in the Ensemble Square Root Filters

Sakov, P. and Oke, P.R. (2008) Implications of the Form of the Ensemble Transformation in the Ensemble Square Root Filters i Monthly Weather Review, 136, s.1042-1053.

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