## TS D-1b

Processing of Biogenic Emissions for OT C / M ANE-V U

Modeling

Bureau of

Air Qualit y Anal ysis a nd Research

Division o f Air Reso urces

Ne w York State Depart me nt o f Environ me ntal Con servation

Alba ny , NY 12233

Septe mb er 19, 2006Biogenic e missions for the ti me period from Januar y 1, 2002 – December 31, 2002 were

calcula ted by N YS DEC u sing the Biogenic E missions Inventory S ys tem (BEIS) version
3.12 integrat ed within S MO KE2.1. General informat ion about BEIS is available at
http://www.epa.gov/AMD/biogen.h tm l w hile docum enta tion about biogenic em issions
processing within SM OKE2.1 is availabl e at
http:// cf.unc.edu /cep/ em

pd/produ cts/sm oke/v ersion2.1/ht ml /c h06s10.htm l and
http:// cf.unc.edu /cep/ em

pd/produ cts/sm oke/v ersion2.1/ht ml /c h06s17.htm l . N ote that the

SM OKE docum enta tion refers to BEIS3.09 and has not ye t been updated for BEIS3.12.

This affects the number

of s pecies model ed as well as the use of different speciation
profiles. Ho wever, the general processing approach has not changes from BEIS3.09 to

BEIS3.12. In short, this processing approach is as follows and wa s utiliz ed b y NY SDEC

for its biogenic emission processing for 8-hr ozone and PM 2 .5 model ing:

1. Nor mb eis3 reads gridded land u se data and emissions factors and produces gridded

norma liz ed biogenic em issions for 34 species/co mpounds. The gridded land use

includes 230 different land use ty pe s. Both sum mer

and winter

emissions factors for

each species/com

pound are provided for each of the 230 land use t yp es. O n output,

Nor mb eis3 generates a file B3GRD which contains gridded summ er and winter

em ission fluxes for the modeling domain that are norma liz ed to 30 °C and a photos yn the tic active radiation ( PAR) of 1000 μmol /m 2 s . In addition, gridded

summ er and winter

leaf area indices (LAI) are also written to B3GRD

.

2. Tm pb eis3 reads the gridded, normali zed em issions file B3GRD and met eorologi cal

data from the MCIP-processed M M5 me teorologi cal fields generated by the

Universit y of Mary la nd for MA NE- V U/OTC mode ling. Specificall y , the following

MM5/MCI P me teorolog ica l variables are u sed by T mp beis3 to compu te hourspecific, gridded biogenic em issions from the norma liz ed emission fluxed contained

in B3GRD: lay er

- 1 air te mperatur e (“T A”), lay er

- 1 pre ssure (“ PRES”), total

inco ming s olar

radiation at the surface ( “RGR ND”), and convective (“RC”) and

non-convective ( “RN”) rainfall. A dditional l y, the emissions for the 34
species/com

pounds mode led b y

BEIS3.12 are converted

to CO, NO , and the CB-IVVOC s pecies utilized in CMA Q via the use of the BEIS3.12-CB-IV s peciat ion

profile. In adition, an optional seasonal switch file, BIOSEASON , wa s utiliz ed to

decide whether to use summ er or winter em issions factors for an y given grid cell on

an y given da y. This file wa s generated by the SM OKE2.1 utilit y Metscan based on
MM5 lay er

- 1 air

temp eratur es to deter mine the date of the last spring frost and first

fall frost at each grid cell. Summ er emission factors are used b y Tm pb eis3 for the

ti me period between the last spring frost and first fall fro st at an y given grid cell,

and winter em ission factors are u sed for the rem aining time period. D ocum entat ion

for the Metscan utilit y is availab le at
http:// cf.unc.edu /cep/ em

pd/produ cts/sm oke/v ersion2.1/ht ml /c h05s07.htm l . A n

ani mat ed GI F file showing the BIOSEASON file u sed by N YS DEC can be found at

ftp://ftp.d ec.sta te.n y. us /dar/ air_resear ch/chogref e/biog_r eports/b3season_ movi e.gif

3. For reporting purposes, the hourl y, speciated, gridded em issions were aggregatedto

the county level for each da y. F or an y given grid cell, emissions are distributed

among the counties intersect ing this grid cell in proportion to the area of each of

these counties within the grid cell. The area gridding surrogates needed for this
aggregration are based on a file obtained from EPA via
http://www.epa.gov/ ttn/ chief/ em ch /spatia l/new/bgpro.12k m_ 041604.us.gz followed

b y windowing for the M ANE-VU/OTC model ing doma in.