Linking global circulation model outputs to regional geomorphic models: a case study of landslide activity in New Zealand

Climate Research

Thomas Glade¹  Michael Schmidt¹ 

关键词: GCM;    Climate change impacts;    Downscaling;    Rainfall-triggered landslides;    Threshold models;   

DOI  :  10.3354/cr025135

来源: Inter-Research Science Publishing

【 摘 要 】

ABSTRACT: General circulation models (GCMs) were constructed for future projections of circulation patterns on a global scale. IPCC emission scenarios, adopted by GCMs, suggest that climate change is due to anthropogenic emissions of greenhouse gases.Application of GCMs to regional-scale studies is difficult due to the different spatial resolutions. Downscaling techniques transfer GCM results to larger scales. Rainfall-triggered landslides are a worldwide phenomenon and can cause socio-economicproblems. Regional models of these geomorphic processes were linked to regionalized GCM outputs for New Zealand. Climate-model outputs from HadCM2SUL were used to produce precipitation and temperature scenarios via analog downscaling. Climate-impactstudies have rarely been developed for New Zealand. For both Wellington and Hawke¹s Bay, climate-change scenarios were applied to 3 deterministic landslide models (the daily rainfall model, the antecedent daily rainfall model and the antecedent soil waterstatus model). All of them relate landslide occurrence to climate conditions. Results give a more reliable projected probability change of landslide occurrence for Wellington than for Hawke¹s Bay. Wellington¹s cold-season precipitation is mostlyassociated with synoptic weather systems depending on large-scale circulation features, captured using the downscaling procedure. In contrast, Hawke¹s Bay receives its peak precipitation from frequent high-magnitude storms. Common to all 3 appliedlandslide models for both regions is the trend of decreased landslide activity for the target period, 2070-2099.

【 授权许可】

Unknown