Steven Goodman GOES-R Program Senior (Chief) Scientist NOAA/NESDIS/ GOES-R Program Office NWS Eastern Region Virtual Satellite Workshop.

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Presentation transcript:

Steven Goodman GOES-R Program Senior (Chief) Scientist NOAA/NESDIS/ GOES-R Program Office NWS Eastern Region Virtual Satellite Workshop Charleston, SC November 9, 2010 GOES-R Geostationary Lightning Mapper (GLM)

2 Natural Hazards and Lightning Tornadoes Hailstorms Wind Thunderstorms Floods Hurricanes Volcanoes Forest Fires Air Quality/NOx

GOES-R Geostationary Lightning Mapper (GLM) LIS/OTD GLM Characteristics Staring CCD imager (1372x1300 pixels) - Single band nm - 2 ms frame rate Mbps downlink data rate - Mass: 114 kg- SU (66 kg), EU (48 kg) - Avg. Operational Power: 290 W - Volume w/ baffle (cm 3 ): 81x66x150 Near uniform spatial resolution/ coverage of total lightning (IC, CG) up to 52 deg lat - 8 km nadir to 14 km at edge % flash detection L1 and L2+ products produced at Wallops for GOES-R Re-Broadcast (GRB) < 20 sec product total latency 3 GLM

GOES-R Geostationary Lightning Mapper (GLM) LIS/OTD minute of observations from TRMM/LIS GLM Combined E-W Coverage May Oklahoma Tornado Outbreak 4 Hurricane Katrina Los Alamos Sferics Array, August 28, 2005, Shao et al., EOS Trans., 86

Physical Basis: Lightning Connection to Thunderstorm Updraft, Storm Growth and Decay Total Lightning —responds to updraft velocity and concentration, phase, type of hydrometeors, integrated flux of particles WX Radar — responds to concentration, size, phase, and type of hydrometeors- integrated over small volumes Microwave Radiometer — responds to concentration, size, phase, and type of hydrometeors — integrated over depth of storm (85 GHz ice scattering) VIS / IR — cloud top height/temperature, texture, optical depth Air Mass Storm 20 July Figure from Gatlin and Goodman, JTECH, Jan adapted from Goodman et al, 1988; Kingsmill and Wakimoto, 1991

0 o C Physical Basis: Flash Rate Coupled to Mass in the Mixed Phase Region (Cecil et al., Mon. Wea. Rev. 2005) Process physics understood Storm-scale model with explicit microphysics and electrification (Mansell) Ice flux drives lightning Physical basis for improved forecasts IC flash rate controlled by graupel (ice mass) production (and vertical velocity) TRMM PR and LIS

Total Lightning Increases with Storm Growth and Updraft Intensification 7

Previous lightning data assimilation work: – Alexander et al., 1999; Chang et al (latent heating) – Papadopoulos et al., 2005 (moisture profiles) – Mansell et al., 2006, 2007 (BL moisture and updraft speed; NLDN/LMA convective trigger switch for Kain-Fritsch) – Weygandt et al., 2006, 2008 (cloud and moisture fields-lightning- reflectivity relationship to create a latent heating-based temperature tendency field, applied to RUC /HRRR during a pre-forecast diabatic digital filter initialization) – Pessi and Businger, 2009 (Vaisala Pacnet long-range lightning data over the open ocean- tropical cyclones, oceanic storms) Workshop on Lightning Modeling and Data Assimilation (2010) – Lightning Data Assimilation into NWP Models

9 March 13, 1993 Superstorm (Alexander et al., 1999 MWR) Lightning Data Assimilation: Reduces Forecast Error Lightning assimilated via latent heat transfer functional relationship

High-resolution explicit convection WRF forecasts can capture the character and general timing and placement of convective outbreaks well; Traditional parameters used to forecast thunder, such as CAPE fields, often overestimate LTG threat area; CAPE thus must be considered valid only as an integral of threat over some ill-defined time; No forward model for LTG available for DA now; thus search for model proxy fields for LTG is appropriate; Research results with global TRMM data agrees with models (e.g., Mansell) that LTG flash rates depend on updraft, precip. ice amounts. 10 WRF Lightning Threat Forecasts Background

WRF Lightning Threat Forecasts Objectives 1.Create WRF forecasts of Total Lightning threat (1-24 h), based on two proxy fields from explicitly simulated convection: - graupel flux near -15 C (captures LTG time variability) - vertically integrated ice (captures anvil LTG area) 2.Calibrate each threat to yield accurate quantitative peak flash rate densities based on VHF Lightning Mapping Array (LMA) total LTG 3.Evaluate threats for areal coverage, time variability 4.Blend threats to optimize results for amplitude, area 5.Examine sensitivity to model mesh, microphysics 11 (McCaul, E. W., Jr., S. J. Goodman, K. LaCasse and D. Cecil, 2009: Forecasting lightning threat using cloud-resolving model simulations. Wea. Forecasting, 24, ).

WRF Lightning Threat Forecasts Methodology 1.Use high-resolution 2-km WRF simulations to prognose convection for a diverse series of selected case studies 2.Evaluate graupel fluxes in the mixed-phase charging zone at -15C level; vertically integrated ice (VII=cloud ice+snow+graupel); dBZ also considered, but set aside because of nonlinearities 3.Calibrate WRF LTG proxies using peak total LTG flash rate densities from North Alabama LMA (NALMA) vs. strongest simulated storms; relationships ~linear; regression line passes through origin 4.Truncate low threat values to make threat areal coverage match NALMA flash extent density obs 5.Blend proxies to achieve optimal performance 6. Experiments to study CAPS 4-km ensembles to evaluate sensitivities 12

HWT Blog 13

HWT Blog 14 EWP ready to go... 5/19/2010 EWP ready to go... 5/19/2010 Some notes from the briefing... The NSSL-WRF lightning threat forecast was shown to the forecasters for this evening and it helped us identify which storms may have stronger updrafts because of their increased lightning output, which we couldn't necessarily determine from the synthetic satellite or radar output. Thursday, May 20, 2010 At 1:30 PM, the the North Alabama Lightning Mapping Array (NALMA) showed lightning activity along the northern Mississippi-Alabama border. The 00Z 20 May NSSL-WRF run in support of the NSSL/SPC EFP shows continued evolution of this convection toward central Alabama by 00-02Z this evening. The lightning threat field in the NSSL-WRF using the McCaul blended vertically integrated ice / graupel flux method shows lightning activity extending north-south through Alabama at 1Z. The predicted flash rates are somewhat less over the far northern part of the domain.

Determine grid resolution (<4 km) at which storm updraft similitude adequate Improve model microphysics (particularly ice) Add simplified electrification parameterization to forecast model Develop simple flash parameterization, such as: o determine threshold of charge for first flash at grid point o estimate subsequent flash rates from charging rates Determine how to map GLM data to model grid in space and time Assimilate GLM flash rates o assimilate where there is existing model convection o determine how to initiate missing convection RESEARCH NEEDED TO ASSIMILATE LIGHTNING FLASH RATES DIRECTLY IN ENSEMBLES Graupel Charging Polarity (SP98 = Saunders, C.P.R., & S.L. Peck, 1998: J. Geophys. Res., 103, 13949). (MacGorman, Mansell, Ziegler et al., NSSL/CIMMS)

CHUVA Ground Validation IOP Sao Paulo, Brazil CHUVA- (“Cloud processes of tHe main precipitation systems in Brazil: A contribUtion to cloud resolVing modeling and to the GPM (GlobAl Precipitation Measurement)”) Collaboration with GOES-R Geostationary Lightning Mapper (GLM) Science Team, INPE (CPTEC/USP, ELAT), and EUMETSAT MTG Lightning Imager Science Team Key scientific measurements include: VHF 3-D Lightning Mapping Array (LMA), TRMM/LIS, MSG SEVERI (ABI proxy data), high speed digital video, VLF lightning networks, dual-pol radar, electric field-change, ancillary meteorological data Participants – – – – Figure 1 – (a) Lightning flash rate density (fl km -2 yr -1 ) for Southeast Brazil. (b) Daily flash rate (flashes per day) around São Paulo and São Luiz do Paraitinga (flash rate for black squares (2 ¼ o ) around these cities). Lightning data is from LIS climatology from 1 January 1998 to 31 December 2008 in ¼ o resolution. Figure 2 – Blue balloons show preliminary configuration for the SPLMA network for CHUVA. The red balloons show a second network configuration, centered at INPE (Sao Jose dos Campos). Yellow “push pin” is the São Luiz do Paraitinga CHUVA IOP site. LMA TRMM/LISMSG/SEVERI LIS Lightning ( )

Summary GLM instrument development on schedule – EDU risk reduction completion September 2010 – Full GLM System CDR December 2010 Ver. 1 of ATBD, Val Plan, Proxy Data, L2 Prototype S/W – Product demonstrations at NOAA Testbeds Hazardous Weather Testbed (2010 Spring Program with VORTEX-II IOP, Summer Program) Joint Hurricane Testbed (NASA GRIP, NSF PREDICT) Aviation Weather Testbed (NextGen) Continue Regional WFO demonstrations (Norman, Huntsville, Sterling, Melbourne, …) New Risk Reduction/Advanced Product Initiatives – Data Assimilation: JCSDA FFO 2010 funding two new GLM investigations – High Impact Weather Working Group- GOES-R DA focus on short-range NWP – Combined sensors/platforms (e.g., ABI/GLM ; ABI/GLM/GPM) – NASA GPM - GLM proxy data 12-mo. campaign in Sao Paulo in partnership with InPE and CHUVA GPM pre-launch ground validation program – NSF Deep Convective Cloud and Chemistry (DC3) Experiment 2012