Interface Enhancements for the current version

Numerous enhancements have been made to Ontar's PcLnWin interfaces. The areas that are currently being pursued include the incorporation of user supplied atmospheric profile data seamlessly, and the inclusion of models that are not being cultivated by the government into PcLnWin. Specifically, Ontar has provided new features and new functions within PcLnWin, allowing users to (1) interactively search the internet, obtain the optimal set of radiosonde data, and automatically generate a layered atmospheric profile as input data of a new atmosphere for a FASCODE calculation; (2) provide guidelines for climatologies relevant to your scenario by incorporating the PcClimat model from EOSAEL/PcEosael into our user interfaces.

Web Based Radiosonde Profiles

This feature performs an internet search of radiosonde data and generates an atmospheric profile for the geometry specified by the user. Currently we are using three data sources: the NOAA database which provides both the current and historical profile data for sites in the United States, the INFOMET data source which provides current profile data on
several hundred sites around the world, and WYU data source which will allow the user to access an on-line database maintained by the University of Wyoming that provides both US and international radiosonde station data.



The interfaces download the data from the selected source and automatically generate a 34 layer model atmosphere based on the initial and final geometry specified by the user as depicted in the figure below (the red arrows indicate the parameters from the radiosonde).




Load Radiosonde File button newly added to the Card3.4 as shown above allows the user to incorporate radiosonde data to FASCODE locally under the circumstance that the radiosonde data is not included in the three on-line radiosonde data sources. When the Load Radiosonde File button is clicked, the screen on the left will appear. From this screen, the user can set up the geometry for his/her case, and locate a radiosonde data file. The current version of PcLnWin provides two types of radiosonde file
format for users to follow: FSL format and WYU format. If the user wants to import his/her own radiosonde data and wants to ask PcLnWin to layer the radiosonde data, he/she has to make the radiosonde data file in exactly either the FSL format or WYU format. Some sample files in FSL format and WYU format are provided with PcLnWin. Ontar may incorporate more types of file formats for radiosonde data into the software at the request of users with special interests.


Climatologies - CLIMAT

The CLIMAT module of EOSAEL provides climatology data both in a standalone mode and as input to atmospheric radiative transport models such as MODTRAN and FASCODE. PcLnWin incorporates CLIMAT into the user interface for FASCODE . The climatology data include averages and standard deviations or percentages of occurrence of 11 meteorological surface parameters (temperature, dew-point temperature, absolute humidity, relative humidity, horizontal visibility, sea-level pressure, windspeed, wind direction, cloudbase height, cloud cover, and Pasquill stability category) in each of 21 weather classes defined by obscuration type (such as rain, snow, and fog), visibility, absolute humidity, and cloud ceiling.

A climatology is generated by specifying a region of interest, month of the year, and time of day. CLIMAT generates the likelihood of occurrence for the 21 meteorological conditions (e.g. Fog, haze, and mist with visibility < 1 km, Dust with visibility < 3 km., No sensible weather and absolute humidity < 10 gm/m3, visibility < 3 km and ceiling height < 1000 m, etc.).


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