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Status of Navy Activities in support of MISST. 28 Nov 2005. NAVOCEANO Activity Status. NAVO Operational Use of Satellite SST. Satellite SST. Mission Planning: Surface Analysis. 10km Analysis. Satellite Altimetry SSH. Tactical Support: Sound Speed Profiles And Currents

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navo operational use of satellite sst
NAVO Operational Use of Satellite SST

Satellite SST

Mission Planning:

Surface Analysis

10km

Analysis

Satellite

Altimetry SSH

Tactical Support:

Sound Speed Profiles

And Currents

@ each grid point

@t0, t1, t2, …72hr

MODAS

3D Daily

Analysis

  • In Situ Profile
  • XBT
  • Float
  • CTD

NCOM or

SWAFS

Daily

72 hr

Forecast

slide4

NAVO Satellite SST Data Flow

FNMOC

NESDIS

NCEP

NASA-JPL

NASA-JPL

Operational

Models and

Archive

RSS AMSRE

AVHRR GAC

AVHRR LAC

GOES

Orbital DEF

Files

Satellite Processing System

AATSR

MTSAT

Binary

Global

database

Matchup

Database (SSES)

OcnQC

ASCII

FNMOC Windsat

NAVO

Operational

Models

MSG

Medspiration

L2P

ASCII

10km Analysis

FNMOC

GODAE

Server

Fleet Support

World Wide Web

Public

navo l2p file status
NAVO L2P File Status
  • Making N-18 GAC and LAC L2P files since 10/2005
  • Sent example files to MeteoFrance and JPL for feedback. Received and implemented feedback. New sample files available
  • XML metadata file in progress
navo l2p file status1
NAVO L2P File Status
  • Contents of NAVO L2P files include….

Latitude Solar Irradiance SI Source

Longitude SI time diff Sea ice source

File time Wind speed AOD source

SST WS time diff Sat zenith angle

Time diff Sea ice fraction Rejection flag

Bias Aerosol Optical Depth Conf flag

StDev AOD time diff Proximity conf

Clim diff WS source

sses calculation status
SSES Calculation Status
  • Making SSES for N-16, N-17, and N-18 AVHRR GAC and AVHRR LAC
  • Making SSES for GOES-West and GOES-East
  • Obtaining AMSR-E, Windsat, MSG, and GOES-9 SST data sets from various sources. Calculating SSES for evaluation and intercomparison.
  • Obtaining AATSR SST data sets.
navo l2p file status plans
NAVO L2P File Status (Plans)
  • Generate N-17 GAC/LAC L2P
  • Partition GAC global L2P orbit files into smaller regional data files so that XML metafile makes more sense?
  • Evaluate/intercompare satellite SSES values for operational use
  • Generate METOP AVHRR L2P files
  • Generate GOES-West and GOES-East L2P files?
slide11

Status Navy Activities in Support of MISST

Global Real-time Sea Ice / SST Analyses (IR + in situ)

  • 9-12 km resolution, 6 hour update cycle
  • available on GODAE server in NRT

http://usgodae2.fnmoc.navy.mil/ftp/outgoing/fnmoc/models/ghrsst

New Observing Systems Added to Ocean Data QC

  • orbital AMSR-E microwave SST data from RSS
  • MSG SST data from CMS

Blended MW/IR SST Analyses

  • measurement error specified by reported SSES
  • representation error from background SST gradients
  • error consistency and validation studies performed
slide12

Navy ocean data quality control system upgraded to handle orbital AMSR-E MW SST data from RSS

  • QC Procedures:
  • background field check (with appropriate errors)
    • climate
    • global/regional analysis
  • water mass classification
  • diurnal warming detection
  • Examples of sequential orbits processed for 30 Sep 2005
  • rejections (perr>0.99) in red
slide13

Global SST analysis backgrounds used in QC of sample AMSR-E orbits 9-12 km resolution, 6 hour update cycle

30 Sep 2005 18Z 1 Oct 2005 00Z

AVHRR GAC in situ AVHRR GAC in situ

slide14

Global SST background error standard deviations (°C) valid 30 Sep 2005

used to QC AMSR-E orbits

x = observed SST  = background SST = background error SD p = probability error

reject if p>0.99, ~3 

  • Background Error Variances in Navy Analysis System
  • vary by position, depth, and analysis variable
  • evolve with time, updated continuously using analyzed increment fields
  • error growth parameterization in data void areas
    • function of age of data on grid and temporal autocorrelations
    • errors asymptote at climate variability in long term absence of observations
slide15

AMSR-E SST data very consistent with AVHRR/in situ analysis backgrounds - analysis differences ~ +/- 2°C climate background differences ~ +/- 4°C

20 UTC

21 UTC

Frequency distributions of AMSR-E SST minus background SST for 30 Sep 05 sample orbits

Red - global 9-12 km analysis

Green - regional 9 km north pole analysis

Blue - GDEM SST climatology

23 UTC

slide16

Locations AMSR-E Rejections 1 July - 1 October 2005

# retrievals = 512,939,677 # rejections = 1,384,503 (0.26%)

Frequency distribution rejected AMSR-E anomalies from global analysis

Binning interval = 0.5°C Max frequency = 339,191at -1.5°C

17,940 retrievals with anomalies > 4°C

Bias rejected observations = -1.95°C

Temperature °C

slide17

Water Mass Classification AMSR-E SST

Frequency distribution of AVHRR GAC SST in Brazil Malvinas Current region for month of July (2001-2004) with mixture of normal probability distribution functions that best describes observed frequency distribution

  • Water mass classified AMSR-E SST retrievals for 16-17 July 2005
  • clearly shows fronts and eddies
  • water mass classification categories used in analysis data thinning procedures
  • maintains SST gradients in analysis
slide18

Snapshot Blended MW-IR-In situ SST Analysis

27 Aug 2005 00Z

9-12 km resolution

12-hr update cycle

Satellite SST In Situ SST AVHRR/GAC AMSR-E Ship, Buoy (fixed, drifting)

Analysis Increments Analyzed SST

slide19

Blended MW/IR Analysis Verification - August 2005 12-hr update cycle, 9 km resolution North Atlantic Basin

  • cold start from climatology on 1 Aug 2005
  • systematic reduction in RMS error from climate to innovation (previous analysis) to residual (current analysis)
  • analysis residuals unbiased
  • innovation biases show diurnal variability
slide20

Analysis Observation Error Standard Deviations

  • sum of a measurement error (em) and a representation error (er)
    • eo = em + er
  • measurement errors specified by SSES from data providers
    • computed from buoy match-ups, varies with retrieval type and time
  • representation errors function of resolution model and resolution of observing system
    • satellite retrieval error computed as function background horizontal gradient (b) when retrieval resolution (rs) exceeds grid resolution (rg)
    • er = b· (rs / rg) rs > rg
    • primarily affects AMSR-E 25-km retrievals at analysis grid resolutions of 9-12 km (AVHRR 8-km GAC retrievals not affected)
    • AMSR-E errors increased 2-fold in western boundary currents
slide21

Jmin Diagnostic MW/IR Analysis - August 2005

  • measures consistency of specified error variances (observation and background) with innovation vector
  • expected value is one if consistent
    • < 1 error variances too large
    • > 1 error variances too small or erroneous data assimilated
  • AMSR-E SSES plus gradient representation error very consistent
slide22

Plans Navy Activities in Support of MISST

Impact Studies Blended MW/IR SST Analyses

  • NOGAPS forecasts (T239, ~55 km resolution), focus on 2005 hurricane season (Jun-Oct)
  • add AMSR-E MW data to real-time GHRSST analyses

Ocean Data QC

  • work with RSS to understand AMSR-E rejections
  • improve background error statistics in QC
  • evaluate AMSR-E diurnal warming estimates

Jmin Diagnostic

  • continue evaluation of gradient representation error
  • feedback to data providers on inconsistencies in SSES measurement errors
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