Transcript Comments on HWP estimation methods Ken Skog Kim Pingoud Methods Topics  Method types  Applicability of methods to approaches  Data needs and availability  Components(variables)

Comments on
HWP estimation methods
Ken Skog
Kim Pingoud
Methods Topics
 Method types
 Applicability of methods to approaches
 Data needs and availability
 Components(variables) needed to estimate
for any approach
Methods Types
Flux data – Input from surveys
– Output:
a) Use lifetimes to estimate outputs
b) Use surveys to estimate outputs
 Stock data
c) Estimate stock change between two
inventories

Methods Applicability
Stock Change
Atmospheric
Flow
Production
Flux using
lifetimes
Need domestic life
times
Need domestic
lifetimes
Need domestic and export
lifetimes
Flux using
surveys of
emissions
Partial domestic
coverage
(not all emissions
can be surveyed)
(means to verify)
Partial domestic
coverage
(not all emissions
can be surveyed)
(means to verify)
Difficult
need to separate domestic
emissions survey into
domestic and import wood
sources
Stock
change
Partial coverage
(e.g. buildings in
country)
(means to verify)
Partial coverage
(e.g. buildings in
country)
(means to verify
Difficult
need to separate inventory
change into domestic and
import wood sources
Potential incomplete
coverage of
secondary wood
products
Potential
incomplete
coverage of
secondary wood
products
Complete coverage for
secondary products exports
Notes
Data Availability
Data
Sources
Harvest, production, trade
FAO, country data
Conversion factors
IPCC Forest GPG, country data
Lifetime for products in use
Limited – previous studies
Need work validating against surveys
of inventory
Disposition after use
Limited – need national estimates
(possible aid from waste sector)
SWDS decay limits / lifetimes
IPCC Waste sector guidelines & GPG
Variables needed to estimate for any approach
Stock Change reporting format
Emissions reporting format
Annual stock change Stock Atmospheric
Production
or flow
change
flow
∆A Forest stock change
+
+
+
Annual stock
change or flow
Forest stock
change
+
+
+
+
+
+
Emissions from
domestic products
EB
(from domestic
RW)
-
-
-
Emissions from
imported products
-
-
∆A
H Domestic harvest
Stock change in
Domestic products
∆B
(from domestic
roundwood)
+
+
stock change in
Imported products
+
+
∆C
Stock change in
Exported products
∆D
(from domestic
roundwood)
+
EC
+
Stock Atmospheric
Production
change
flow
Emissions from
exported products
ED
(from domestic
RW)
-
I Imported products
-
I Imported products
+
Ex Exported products
+
Ex Exported products
-
TOTAL forest and
HWP change
SC
AF
P
TOTAL forest and
HWP change
SC
AF
P
Harvested Wood Products: Stocks and flows
EB EC
ED
ATMOSPHERE
E
NEE
Own Country
A
Forest
ecosystems
H
E
E EX DOM
E IM
DOM
Abroad
B HWP C
D HWP
in use
in use
or in waste sites
or in waste
PEX
Ex
I
PIM
sites
EX OTH
Harvested Wood Products:
Comparison of Approaches
U.S. HWP Removals in 2002 = 59 Tg C
Variables from U.S. HWP Estimation Methods
Tg C
Stock Change or Flow Variables
A
Domestic Product Stock Change (from domestic RW)
58
B
Exported Product Stock Change (from domestic RW)
1
C
Imported Product Stock Change
10
D
Flow of imports
13
E
Flow of exports
7
Approaches:
Production (A+B)
=
59
Stock Change (A+C)
=
68
Atmospheric Flow (A + C – (D – E))
=
62