In:
Geoscientific Model Development, Copernicus GmbH, Vol. 13, No. 11 ( 2020-11-10), p. 5425-5464
Abstract:
Abstract. Human land use activities have resulted in large
changes to the biogeochemical and biophysical properties of the Earth's
surface, with consequences for climate and other ecosystem services. In the
future, land use activities are likely to expand and/or intensify further to
meet growing demands for food, fiber, and energy. As part of the World
Climate Research Program Coupled Model Intercomparison Project (CMIP6), the
international community has developed the next generation of advanced Earth
system models (ESMs) to estimate the combined effects of human activities
(e.g., land use and fossil fuel emissions) on the carbon–climate system. A
new set of historical data based on the History of the Global Environment
database (HYDE), and multiple alternative scenarios of the future
(2015–2100) from Integrated Assessment Model (IAM) teams, is required as
input for these models. With most ESM simulations for CMIP6 now completed,
it is important to document the land use patterns used by those
simulations. Here we present results from the Land-Use Harmonization 2
(LUH2) project, which smoothly connects updated historical reconstructions
of land use with eight new future projections in the format required for
ESMs. The harmonization strategy estimates the fractional land use patterns,
underlying land use transitions, key agricultural management information,
and resulting secondary lands annually, while minimizing the differences
between the end of the historical reconstruction and IAM initial conditions
and preserving changes depicted by the IAMs in the future. The new approach
builds on a similar effort from CMIP5 and is now provided at higher
resolution (0.25∘×0.25∘) over a longer time domain (850–2100, with
extensions to 2300) with more detail (including multiple crop and pasture
types and associated management practices) using more input datasets
(including Landsat remote sensing data) and updated algorithms (wood harvest
and shifting cultivation); it is assessed via a new diagnostic package. The
new LUH2 products contain 〉 50 times the information content of
the datasets used in CMIP5 and are designed to enable new and improved
estimates of the combined effects of land use on the global carbon–climate
system.
Type of Medium:
Online Resource
ISSN:
1991-9603
DOI:
10.5194/gmd-13-5425-2020
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2020
detail.hit.zdb_id:
2456725-5
