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2014-15 NADP-CLAD
Call for Critical Loads and Supporting Data
Announcement and Metadata Description
Final– 10/1/14
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Introduction
This document contains information regarding the 2014-15 Call for critical load data to
become part of the CLAD National Critical Load database (NCLD).
Critical Load Atmospheric Deposition (CLAD) Science Committee
Beginning in 2006, the primary forum for critical loads research and development coordination
in the US has been the Critical Loads of Atmospheric Deposition Science Committee (CLAD) of
the National Atmospheric Deposition Program (NADP) (http://nadp.sws.uiuc.edu/clad/).
The goals of CLAD are to:
1. Facilitate technical information sharing on critical loads topics within a broad multiagency/entity/audience;
2. Fill gaps in critical loads development in the US;
3. Provide consistency in development and use of critical loads in the US;
4. Promote understanding of critical loads approaches through development of
outreach and communications materials.
Starting in 2010, the “FOCUS Pilot Study” project, CLAD, gathered and synthesized empirical
and calculated critical loads data and information from dozens of regional- and national-scale
projects. The first round of critical load data synthesis was used for an informal, unofficial
submission to the UNECE Coordinating Center on Effects (CCE). This unofficial submission
represents the interest of a growing critical loads science community in the United States.
CLAD members submitted data to this cooperative effort as a productive and meaningful way to
share information to improve methods for estimating, calculating, mapping, interpreting, and
refining critical loads. Since then, the CLAD critical load database has been improved and some
additional values have been added, however this Call for Data represents the first “official”
request for new data from the critical load community.
Types of Critical Loads
The current national database contains surface water critical loads of acidity, critical loads of
acidity for forested ecosystems, and empirical critical loads of nitrogen. The 2014-2015 “call”
seeks to update and add to the existing data for these critical loads. In addition, we seek
information to support two additional critical loads in the database; surface water critical loads
for nutrient enrichment and nutrient nitrogen critical loads for forested ecosystems. While data
that is national in scope is desired, regional critical load information is also welcome.
Data Submission
Critical load data and supporting information can be submitted using the Excel file called
“CLAD_CL_Data_10-1-2014.xlsx” (available at the CLAD website). This file includes
instructions and separate tables for the various types of critical loads. The variables contained in
each table are listed on the following pages. It is expected that submissions will include a
completed Table 1, Site Info, in addition to the appropriate table(s) for the specific critical load
of interest. Contributors are welcome to add columns for new variables as needed. To submit
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critical load data, please e-mail data files to [email protected]. If a file is too large for email, data files can be uploaded to the Call-for-data folder on the NADP-University of Illinois
Box file sharing account. Jason Lynch will provide instructions on request.
Deadline for data submission is April 1, 2015.
Questions
Please contact Jason Lynch, US EPA at [email protected] or 202-343-9257 if you
have any questions on the call for data.
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Data structure
Table 1. Structure of the database-table ‘SiteInfo’.
Variable
Explanation
SiteID
Project specific identifier of the site
Lon(DD)
Longitude (decimal degrees)
Lat(DD)
Latitude (decimal degrees)
EcoArea
Area of the ecosystem (km2) represented by the CL
Protection
No specific nature protection applies
Special Protection Area (Class I Area)
Special Protection Area (Wilderness)
Special Protection Area (Federal Lands)
Special Protection Area (State)
Special Protection Area (Private)
protection status unknown
EcoRegionI
EcoRegionII
EcoRegionIII
EcoNameI
EcoNameII
EcoNameIII
Reference
PI
The FOCUS group can generate this if you
don’t already know it.
EcoRegion code Level I
EcoRegion code Level II
EcoRegion code Level III
EcoRegion name Level I
EcoRegion name Level II
EcoRegion name Level II
Research publication or report that contains the
original calculation or determination of the critical
loads submitted. Include the full associated citation
and DOI.
Name of Principle Investigator
Note
1
2
2
2
2
2
2
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Notes on Table 1 (see last column):
1) Use the SiteID from the project where the data originate. For example, if the critical load is
based on EMAP lake NY065, then use that as the SiteID.
2) EcoRegion (http://www.epa.gov/wed/pages/ecoregions.htm) can determined through
geospatial analysis by the FOCUS group if the project does not have this information readily at
hand.
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Table 2. Attributes for Critical Loads of acidity and nutrient nitrogen for “Forest
Ecosystem”
Variable
Explanation
Note
SiteID
Identifier of the site (same as in Table 1)
CLmaxS
Maximum critical load of sulphur
CLminN
Minimum critical load of nitrogen
CLmaxN
Maximum critical load of nitrogen
CLnutN
Critical load of nutrient nitrogen
CL_N_S
Combined critical load of nitrogen and sulfur
nANCcrit
The quantity –ANCle(crit)
Units
Units
eq ha–1 a–1
meq m2-1 a–1
kg ha-1 a-1
Add your units
crittype
Chemical criterion used for acidity CL calculations:
molar[Al]: [Bc]
[Al] (eq m–3)
base sat (%) or change in base sat or no change in base sat
pH
[ANC] (eq m–3)
molar[Bc]:[H]
molar [Bc]:[Al]
molar [Ca]:[Al]
molar [Al]:[Bc] AND [Al] > 0.1meq/L
Add your own
critvalue
Critical value for the chemical criterion given in ‘crittype’
Units_variable Units:
eq ha–1 a–1
meq m2-1 a–1
Kg ha-1 a-1
Add your units
**Unit variable fields are not included in this table, but are
found in the excel file
BCdep
Total deposition of base cations (BC = Ca+Mg+K+Na)
CLdep
Total deposition of chloride
BCwe
Weathering of base cations (BC = Ca+Mg+K+Na)
BCupt
Net removal of base cations (BC = Ca+Mg+K+Na)
Qle
Amount of water percolating through the root zone (mm a–1)
lgKAlox
Equilibrium constant for the Al-H relationship (log10) (The
variable
formerly known as Kgibb)
Nimacc
Long-term nitrogen accumulated or immobilized in the soil (eq
ha–1 a–1)
Nupt
Net removal of nitrogen (eq ha–1 a–1)
fde
Denitrification fraction (0_fde<1) (-)
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Amount of nitrogen denitrified (eq ha–1 a–1)
Method used to calculate BCwe:
VSD
MAGIC
Pnet-BGC
Days-Chem
PROFILE
Clay correlation-substrate method
Mass balance
Site specific approaches (Sr etc.)
Add your own
BCdatsou
Data source for BCmeth
SSUEGO
STATSGO2
FIA
Site measurements
Add your own
Nsinks
Net loss of nitrogen (Nimacc + Nupt + Nde) (eq ha–1 a–1)
RootDep_m
Rooting zone depth (M)
expAl
Exponent for the Al-H relationship (=3 for gibbsite
equilibrium)
cOrgacids
Total concentration of organic acids (m*DOC) (eq m–3)
DepYear
Year for deposition measurements
WDEPSo
Wet deposition source:
NADP
NADP-Grimm
HRDM
CMAQ
Measured on site Wet
Measured on site Bulk (Total deposition)
Add your own
DDEPSo
Dry deposition source:
CASTNET
HRDM
CMAQ
Measured on site Dry
Add your own
CFDEP
Is Cloud/fog dep included?
Yes
No
Notes on Table 2 (see last column): None
Nde
BCmeth
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Table 3. Attributes of the table for critical loads of acidity for ‘Surface Water’.
Variable
Explanation
SiteID
Identifier of the site (same as in Table 1)
CLmaxS
Maximum critical load of sulfur
CLminN
Minimum critical load of nitrogen
CLmaxN
Maximum critical load of nitrogen
nANCcrit
The quantity – ANCle(crit)
Units
Units
eq ha–1 a–1
meq m2-1 a–1
kg ha-1 a-1
Add your units
crittype
Criterion used:
[ANC] (ueq/L)
[NO3] (ueq/L)
Add your own
critvalue
Value of the criterion used
Units_
Units:
critvalue
eq ha–1 a–1
meq m2-1 a–1
Kg ha-1 a-1
Add your units
**Unit variable fields are not included in this table, but are found
in the excel file
BCdep
Total deposition of base cations (BC = Ca+Mg+K+Na)
CLdep
Total deposition of chloride
BCwe
Weathering of base cations (BC = Ca+Mg+K+Na)
BCmeth
Method used to calculate BCwe:
Other
VSD
MAGIC
Pnet-BGC
Days-Chem
PROFILE (applied to a catchment)
Clay correlation-substrate method (applied to a catchment)
F-Factor
Landscape Regression with water quality data
Landscape Regression with landscape data
DepYear
Year for deposition measurements
BCupt
Net growth uptake of base cations (BC = Ca+Mg+K+Na)
Qs
Annual runoff flux
DOC
DOC concentration in the lake
Nimacc
Acceptable nitrogen immobilised in the soil
Nupt
Net growth uptake of nitrogen
Nitrif
Nitrification in the catchment
Denitrf
Denitrification rate in catchment
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Note
Nsinks
NH4dep
NO3dep
LakeYear
WSH_ha
WDEPSo
Net loss of nitrogen (Nimacc + Nupt + Nde)
Total deposition of ammonia
Total deposition of nitrate
Year or average year for lake measurements (YYYY)
Size of watershed (ha)
Wet deposition source:
NADP
NADP-Grimm
HRDM
CMAQ
Measured on site Wet
Measured on site Bulk (Total deposition)
Add your own
DDEPSo
Dry deposition source:
CASTNET
HRDM
CMAQ
Measured on site Dry
Add your own
CFDEP
Is Cloud/fog dep included?
Yes
No
Notes on Table 3 (see last column): None
Table 4. Attributes for Critical Loads of nutrient nitrogen for “Surface Waters”
Variable
Explanation
Note
SiteID
Identifier of the site (same as in Table 1)
CLnutN
Critical load of nutrient nitrogen
Units
Units
eq ha–1 a–1
meq m2-1 a–1
kg ha-1 a-1
Add your units
COMID_Reach
NHD+_Reach
crittype
NHD+ COMID for the reach
NHD+ reach code
Criterion used:
[NO3]
(ueq/L)
Add your
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critvalue
Units_critvale
own
Value of the criterion used
Value of the criterion used units
**Unit variable fields are not included in this table, but are
found in the excel file
DIN
Dissolved Inorganic Nitrogen
Unit_DIN
Dissolved Inorganic Nitrogen units
TP
Total Phosphorus
Unit_TP
Total Phosphorus units
NO3_observed Observed Nitrate (NO3-).
NO3_predicted Predicted Nitrate (NO3-)
Units_NO3
Nitrate (NO3-) units
NH4dep
Ammonium deposition (NH4)
Units_NH4dep Units:
eq ha–1 a–1
meq m2-1 a–1
Kg ha-1 a-1
Add your units
NO3dep
Nitrate deposition (NO3)
Units_NO3dep Units:
eq ha–1 a–1
meq m2-1 a–1
Kg ha-1 a-1
Add your units
WDEPSo
Wet deposition source:
NADP
NADP-Grimm
HRDM
CMAQ
DDEPSo
Dry deposition source:
Other
CASTNET
HRDM
CMAQ
CFDEP
Is Cloud/fog dep included?
Yes
No
Notes on Table 4 (see last column): None
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Table 5. Attributes of the table Empirical Critical Loads ‘EmpNload’.
Variable
Explanation
SiteID
Identifier of the site (same as in Table 1)
CLempN
Empirical critical load of nitrogen
Units
Units
eq ha–1 a–1
meq m2-1 a–1
Kg ha-1 a-1
Add your units
Recep
Receptor
fungi
lichen
herbaceous species
forest, other
Add your own
EmpMeth
Reference how the initial CL was determined or calculated.
Pardo et. al 2012
Geiser et al. 2010
Add any new referenced methods.
WDEPSo
Wet deposition source:
NADP
NADP-Grimm
HRDM
CMAQ
Measured on site Wet
Measured on site Bulk (Total deposition)
Add your own
DDEPSo
Dry deposition source:
CASTNET
HRDM
CMAQ
Measured on site Dry
Add your own
CFDEP
Is Cloud/fog dep included?
Yes
No
Notes on Table 5 (see last column): None
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Note