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Changes of Seasonally Frozen Ground from 1967 to 1997 in Qinghai-Tibetan Plateau. Lin Zhao Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences. Contents. Introduction Data Sources and Methods

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changes of seasonally frozen ground from 1967 to 1997 in qinghai tibetan plateau

Changes of Seasonally Frozen Ground from 1967 to 1997 in Qinghai-Tibetan Plateau

Lin Zhao

Cold and Arid Regions Environmental and

Engineering Research Institute, Chinese Academy of Sciences

contents
Contents
  • Introduction
  • Data Sources and Methods
  • Climate and SFG Thickness Changes in Different Regions
  • Changes of freezing duration
  • Changes of ground surface temperatures
introduction
INTRODUCTION
  • Study area
  • SFG distribution
  • Climate warming
at fluctuation in qtp and northern hemisphere in 20 th century
AT Fluctuation in QTP and Northern Hemisphere in 20th Century

QTP (Liu, et al., 1998)

Northern Hemisphere (Jones and Briffa, 1992)

data sources and methods
DATA SOURCES AND METHODS
  • Data selection
    • Data used: AT, Precipitation, SFG thickness, GST
    • Stations selection
  • Data processing
    • Missing data
  • Data standardizing
    • Different unit, value and changing amplitude
  • Hierarchical Cluster Analysis
data sources and methods1
DATA SOURCES AND METHODS
  • Missing data
    • Temperatures
    • Freezing depths
    • Freezing duration
climate and sfg thickness changes in different regions
Climate and SFG Thickness Changes in Different Regions
  • To identify the differences of SFG changes in different geographic regions
  • Criterion used for cluster classification
    • Geo-location: Latitude, Longitude, elevation
    • Main climatic factors: MAAT and MAP
distribution of different clusters classified based on location and main climatic factors

Elevation: 1500~3500 m

MAAT: 0.8~8˚C (mean: 4.1)

AP: 16~360 mm (mean: 194)

MAWAT:-0.5~-7.2 ˚C (mean: -4.2)

SFG: 80~220 cm (mean: 127.8)

Distribution of Different Clusters Classified based on Location and Main Climatic Factors

Elevation: 800~1500 m

MAAT: 10~12˚C (mean: 11.4)

AP: 20~60 mm (mean: 38)

MAWAT:-2~3.0 ˚C (mean: 1.5)

SFG: 40~75 cm (mean: 55.7)

Elevation: 2700~4300 m

MAAT: -0.4~8.6˚C (mean: 3.8)

AP: 270~900 mm (mean: 540)

MAWAT:-7.2~4 ˚C (mean: -1.9)

SFG: 8~130 cm (mean: 64.7)

Elevation: 3900~4800 m

MAAT: 0.3~-3˚C (mean: -1.2)

AP: 430~550 mm (mean: 481)

MAWAT:-6.2~-9.8 ˚C (mean: -8)

SFG: 170~330 cm (mean: 232)

slide16

QUESTIONS?

THANKS!