NOUS41 KWBC 041403 AAA

PNSWSH

 

Technical Implementation Notice 14-41 Amended

National Weather Service Headquarters Washington DC

900 AM EST Thu Dec 4 2014 

 

To:       Subscribers:

          -Family of Services

          -NOAA Weather Wire Service

          -Emergency Managers Weather Information Network

          -NOAAPORT

          Other NWS Partners, Users and Employees

 

From:     Timothy McClung

          Science Plans Branch Chief

          Office of Science and Technology

 

Subject:  Amended: Ozone Air Quality Prediction Update

          Effective January 27, 2015.

 

Amended to change implementation date from November 25, 2014, to

January 27, 2015

 

Effective on or about Tuesday, January 27, 2015, beginning with

the 1200 Coordinated Universal Time (UTC) run, the National

Centers for Environmental Prediction (NCEP) will upgrade the

Community Multi-scale Air Quality (CMAQ) modeling system that

provides ozone air quality predictions.

 

The updated CMAQ model includes an updated carbon bond gas phase

(CB05) mechanism and additional updates. This update is for the

contiguous 48 states (CONUS) domain.

 

Ozone predictions from the updated CMAQ model are available

through a parallel feed at the links below.

 

HTTP:

http://www.ftp.ncep.noaa.gov/data/nccf/com/aqm/para/aqm.YYYYMMDD

 

FTP:

ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/aqm/para/aqm.YYYYMMDD

 

where YYYYMMDD is the year, month, day.  

 

The names of the CONUS grib files have changed to the following:

 

aqm.tCCz.8ho3.227.grib2

aqm.tCCz.1ho3.227.grib2

aqm.tCCz.1ho3-max.227.grib2

aqm.tCCz.8ho3-max.227.grib2

 

Additionally Alaska and Hawaii grib files are now available:

 

aqm.tCCz.8ho3.196.grib2

aqm.tCCz.1ho3.196.grib2

aqm.tCCz.8ho3-max.196.grib2

aqm.tCCz.1ho3-max.196.grib2

aqm.tCCz.8ho3.198.grib2

aqm.tCCz.1ho3.198.grib2

aqm.tCCz.8ho3-max.198.grib2

aqm.tCCz.1ho3-max.198.grib2.

 

The CMAQ GRIB products from the parallel feed are also

disseminated via the NCEP website:

 

ftp://ftp.emc.ncep.noaa.gov/mmb/aq/for_NDGD_5x_expr/

 

and the products will be displayed at:

 

http://airquality.weather.gov/expr/

 

The hourly ozone maps are available at:

http://www.emc.ncep.noaa.gov/mmb/aq/cmaq/web/html

The daily maximum ozone maps are available at

http://www.emc.ncep.noaa.gov/mmb/aq/para/web/html/max_p6.html

The current operational CMAQ model will continue providing

forecasts through

 

ftp://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndgd/GT.aq/AR.conus/

 

and displayed at

 

http://airquality.weather.gov/

 

The scientific enhancements include the following:

 

-  Updated rate constants for Carbon Bond Mechanisms (CB05) 

-  Inclusion of monthly varying lateral boundary conditions

   for 36 gaseous and aerosol species below 7km altitude

-  Modified dry deposition velocity calculation

-  Constraint of planetary boundary layer height in the model

   to be at least 50m

-  Faster removal of organic nitrate from the atmosphere

-  Inclusion of particulate emissions from wildfires based on

   wildfire locations observed over the previous day

-  Suppression of soil emissions when terrain is covered by

   ice or snow

-  Inclusion of windblown dust emissions using threshold

   friction velocity and soil wetness fraction with

   climatological source composition and locations

 

There are no changes to existing products or their contents. 

 

Due to this upgrade, the CONUS products will be delivered 30 to

35 minutes later than in the past.

 

For questions or comments, contact:

 

Ivanka Stajner

NOAA/NWS/OST

Silver Spring, MD 20910

ivanka.stajner@noaa.gov

301 427 9103

 

NWS National Technical Implementation Notices are online at:

 

http://www.nws.noaa.gov/os/notif.htm

 

$$