Roland Vogt – Radiation Measurements in Gobabeb ... - GEWEX
Roland Vogt – Radiation Measurements in Gobabeb ... - GEWEX
Roland Vogt – Radiation Measurements in Gobabeb ... - GEWEX
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1 <br />
Radia&on <strong>Measurements</strong> <strong>in</strong> <strong>Gobabeb</strong>, Namibia <br />
<strong>Roland</strong> <strong>Vogt</strong> <br />
Folke Olesen<br />
Mary Seely <br />
MCR <strong>–</strong> Meteorology, Climatology, Remote Sens<strong>in</strong>g <br />
Department Environmental Sciences <br />
University of Basel, Switzerland <br />
MSA -‐ Meteorological Satellite Analysis <br />
Karlsruhe InsOtute of Technology, Germany <br />
<strong>Gobabeb</strong> Research and Tra<strong>in</strong><strong>in</strong>g Centre <br />
Namibia <br />
These three ... made a solemn vow (John Barleycorn) <br />
Technical Assistance Agreement/Memorandum of Understand<strong>in</strong>g <br />
“....shall cooperate <strong>in</strong> common fields of Basel<strong>in</strong>e Surface Radia&on Network” <br />
(...at least un&l end of 2018) <br />
Walter Holch (<strong>Gobabeb</strong>), Andrea Pitacco (Univ. of Padova, IT), <br />
Michael Schmutz (MCR), <strong>Gobabeb</strong> staff <br />
BSRN workshop, Potsdam, Aug 1-‐3, 2012
BSRN workshop, Potsdam, Aug 1-‐3, 2012 <br />
2
Where <br />
is <br />
<strong>Gobabeb</strong> <br />
located? <br />
3
sem<strong>in</strong>ar rooms, guest houses <br />
„on the rock“: tracker locaOon <br />
offices, library, labs, uOliOes, water tower <br />
solar power staOon
www.gobabeb.org
6 <br />
Facts about <strong>Gobabeb</strong> <br />
Founded <strong>in</strong> 1962 by Dr. Charles Koch. 50 th anniversary!!! S<strong>in</strong>ce then <br />
<strong>Gobabeb</strong> has been conducOng environmental research <strong>in</strong> the Namib Desert <br />
Climate <strong>in</strong> brief: extremely arid, moderate seasonality, <br />
moderate annual and diurnal temperature amplitude <br />
In 50 years: 331 ra<strong>in</strong>y days, total of 1213 mm, <br />
average 25 mm, wedest year 2011 (159 mm) <br />
Currently: MPI for Biogeochemistry Jena → tall tower site → trace gas monitor<strong>in</strong>g → GAW dataset. <br />
BSRN workshop, Potsdam, Aug 1-‐3, 2012
7 <br />
What are we do<strong>in</strong>g <strong>in</strong> <strong>Gobabeb</strong>?<br />
<br />
KIT (s<strong>in</strong>ce 2008) <br />
Ground truth measurements of Land Surface Temperatures (LST) <br />
2 <strong>in</strong>frared thermometers for LST, 1 for sky temperaures (KT15) <br />
1 net radiometer (CNR1) <br />
2 levels (3, 27m) basic meteorology (T, RH, WD, WV) <br />
MCR (s<strong>in</strong>ce 9/2009) <br />
Energy balance measurements <br />
turbulent heat fluxes at up to 3 levels (with sonics CSAT3) <br />
(s<strong>in</strong>ce 03/11 open-‐path gas analyzer added: Li7500, s<strong>in</strong>ce 07/12 EC150) <br />
soil heat fluxes with 5 heat flux plates, soil temperature profile (6 depths) <br />
net radia1on added a CNR4 at 30 m. <br />
several field campaigns (dual beam sc<strong>in</strong>Ollometer, QC of net radiaOon) <br />
(Bienniale: field course for students <strong>in</strong> meteorological measurements) <br />
BSRN workshop, Potsdam, Aug 1-‐3, 2012
Mean monthly diurnal course of components of net radia&on Rn <br />
Rsd, Rsu, Rld, Rlu, Rn <br />
pikS <br />
BSRN workshop, Potsdam, Aug 1-‐3, 2012
Mean monthly diurnal course of boradband albedo <br />
pikS <br />
BSRN workshop, Potsdam, Aug 1-‐3, 2012
10 <br />
Broadband albedo versus sun eleva&on <br />
pikS <br />
BSRN workshop, Potsdam, Aug 1-‐3, 2012
Mean monthly diurnal course of soil heat flux <br />
surface storage change 0 to -‐4 cm heat flux plate -‐4 cm <br />
pikS <br />
BSRN workshop, Potsdam, Aug 1-‐3, 2012
Mean monthly diurnal course of <br />
available energy, sensible heat flux und closure gap <br />
pikS <br />
BSRN workshop, Potsdam, Aug 1-‐3, 2012
13 <br />
The <strong>Gobabeb</strong> “BSRN like” radia&on set-‐up <br />
BSRN workshop, Potsdam, Aug 1-‐3, 2012
14 <br />
Installa&on team (Joseph, Richard,...., Ueli, Michael, Walter) <br />
BSRN workshop, Potsdam, Aug 1-‐3, 2012
15 <br />
Ma<strong>in</strong>tenance team (daily check and clean<strong>in</strong>g) <br />
BSRN workshop, Potsdam, Aug 1-‐3, 2012
16 <br />
The last two days…….. <br />
800 <br />
700 <br />
600 <br />
500 <br />
SWdn Diff SW NIc <br />
NIc SWdnref LWdnref <br />
W m -‐2 <br />
400 <br />
300 <br />
200 <br />
100 <br />
0 <br />
7/30/2012 0:00 7/30/2012 12:00 7/31/2012 0:00 7/31/2012 12:00 8/1/2012 0:00 <br />
UTC <br />
BSRN workshop, Potsdam, Aug 1-‐3, 2012
BSRN Global Network recommended QC tests, V2.0 <br />
15.5.2012 to 29.7.2012 = 109’440 1 m<strong>in</strong> averages brown = number of values outside limits <br />
17 <br />
N tot =107436 <br />
Physical possible <br />
limits all <br />
Physical possible <br />
limits night <br />
Extremely rare <br />
limits all <br />
Extremely rare <br />
limits night <br />
SWdn, SWdn ref 17/35 17/35 40513 40513 <br />
Diffuse SW 134 134 45056 45056 <br />
DirectSW, Sir 0 0 0 0 <br />
Direct SW 0 0 0 0 <br />
LWdn, LWdnref 0 0 0 0 <br />
50Wm -‐2 Outside ±8% >75° >50Wm -‐2 Outside ±15% <br />
(Global SW)/(Sum SW) 36509 21 7317 77 <br />
< 1.05 < 1.10 <br />
Diffuse SW/(Global SW) 36509 0 7474 0 <br />
LWdn, LWdnref <br />
to Air Temperature <br />
Outside limits : 0 <br />
BSRN workshop, Potsdam, Aug 1-‐3, 2012
18 <br />
Some data: comparison of SWdn and SWdnref <br />
BSRN workshop, Potsdam, Aug 1-‐3, 2012
19 <br />
Some data: comparison of direct normal 1 and 2 <br />
BSRN workshop, Potsdam, Aug 1-‐3, 2012
20 <br />
Some data: comparison of LWdn and LWdnref <br />
BSRN workshop, Potsdam, Aug 1-‐3, 2012
21 <br />
Some data: Difference Global <strong>–</strong> Sum SW <br />
BSRN workshop, Potsdam, Aug 1-‐3, 2012
22 <br />
Some data: nocturnal offset of CMP22 and CHP1 <br />
BSRN workshop, Potsdam, Aug 1-‐3, 2012
23 <br />
Next steps <br />
See what the BSRN workshop decides <br />
……. <br />
Install LWup and SWup <strong>in</strong> the gravel pla<strong>in</strong>s <br />
Implement QC procedure, add some f<strong>in</strong>e tun<strong>in</strong>g <br />
Submit data to BSRN data base <br />
……. <br />
BSRN workshop, Potsdam, Aug 1-‐3, 2012
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