NOAA/NESDIS ground support of ESA’s ADM/Aeolus mission

LWG Bar Harbor, Aug 24-26 2010

NOAA/NESDIS ground support of ESA’s ADM/Aeolus mission

Lars Peter Riishojgaard

Joint Center for Satellite Data Assimilation


ADM data policy

• ADM/Aeolus is an R&D mission, but … due to the value of these observations to

NWP, ESA and WMO are making ADM part of the WMO Global Observing System

• Unprecedented step for ESA• Data will be made available to the WMO

member NMHS’s in “real time” • Disseminated via the GTS


Baseline ground segment

• Single receiving station at Svalbard– Full orbital dumps; 50 Mb of science data

per orbit– 110 s total visibility required for one orbit

• 30 s for antenna locking• 80 s for data dump• Any additional data may require additional time

(e.g. QRT or stored orbits)


NRT stream

– Near Real Time, defined as data (level 1B) having latency of 3 h or less for the end user

– NRT is targeted for global NWP and should in principle be available for all orbits

– Low ADM orbit height => blind orbits in spite of high latitude of Svalbard

– WMO requirement for global NWP is 1 h


QRT stream

• Quasi Real Time data targeted at regional NWP and other applications– Latency of 30 min or less– Assuming 20 (or 15) minutes total processing

time, the QRT stream will consist of the last 10 (or 15) minutes of the orbit dumped either at the beginning of the pass (“AEAP”) or at the end of the pass (“ALAP”)

– No Southern Hemisphere QRT data in Svalbard only scenario


QRT “AEAP” Scenario using Svalbard and Troll, assuming 15 (red+blue) or 20 minutes (blue) total processing time

(all figures courtesy of H. Nett, ESA/ESTEC)


QRT (II)

• QRT availability for Europe is guaranteed under combined Troll/Svalbard scenario

• QRT will not be available for North America under this scenario

• However, a receiving station at Troll now appears unlikely due to financial constraints

• On request from LPR, ESA has studied implications of adding either Wallops or Svalbard as additional ground receiving stations


ADM pass duration at Svalbard (red) and Fairbanks (green)


ADM pass duration (elevation > 2 deg) at Svalbard (red) and Wallops (blue)


ADM pass duration (elevation > 1 deg) at Svalbard (red) and Wallops (blue)


QRT “AEAP” Scenario using Svalbard and Wallops, assuming 15 (red+blue) or 20 minutes (blue) total processing time


QRT (III)

• Fairbanks adds relatively little to QRT scenario; sees basically the same orbits as Svalbard; adds robustness for NRT stream

• Due to near-perfect longitude, Wallops is a useful addition in spite of the low latitude

• Assuming 1 deg minimum elevation angle, Northern Hemisphere QRT will be available for all orbits under Svalbard/Wallops scenario


Proposed US involvement

• NOAA/NESDIS owns suitable antennas at Wallops that are currently not fully utilized

• Dedicating an antenna to ADM as a secondary receiving station for a few (<6) orbits per day, 2-3 minutes per orbit would accomplish the following– Guarantee QRT (< 30 min latency) for eastern

North America– Add robustness and reliability of global NRT data


Current status• After briefings given to Louis Uccellini (NWS/NCEP),

Kathy Kelly (NESDIS/OSDPD) and COPC, NESDIS gave their approval the idea, subject to financial constraints

NOAA/NESDIS ground support of ESA’s ADM/Aeolus mission

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