seasonal climate cycles seasonal climate cycles sea level pressure
TRANSCRIPT
Seasonal Climate CyclesSeasonal Climate Cycles
Sea level pressure
Sea Level PressureSea Level Pressure
• Pressure is a measure of the atmosphere’s weight
• Lows associated with colder temperatures
• Highs associated with warmer temperatures
SEASONAL CYCLE OF PRESSURE - SEASONAL CYCLE OF PRESSURE - NORTHERN HEMISPHERENORTHERN HEMISPHERE
LOOK FOR THE FOLLOWNG:
WINTER (OCEANS WARMER THAN LAND)
• DOMINANCE OF LOWS OVER NORTHERN OCEANS• HIGH PRESSURE OVER COMPARATIVELY COLD LAND
SUMMER (LAND WARMER THAN OCEANS)
• DOMINANCE OF HIGHS OVER NORTHERN OCEANS• LOW PRESSURE OVER RELATIVELY WARM LAND
OTHER
• TREMENDOUS WINTER/SUMMER PRESSURE CHANGE OVER ASIA (PART OF THE ASIAN MONSOON)
• GENERAL LOW PRESSURE REGION NEAR THE EQUATOR
MAXIMUM DEVELOPMENT OF: ALEUTIAN AND ICELANDIC LOWS SIBERIAN AND BERMUDA HIGHS
JAN
FEB
SIBERIAN HIGH INTENSEOTHER HIGHS AND LOWS WEAKEN
MAR
ALEUTIAN AND ICELANDIC LANDS WEAKENPACIFIC AND BERMUDA HIGHS EXPAND AND STRENGTHEN
APR
LOWS CONTINUE TO WEAKEN, HIGHS TO STRENGTHEN
MAY
HIGHS DOMINANT OVER OCEAN, LOWS OVER LAND
JUN
LOWS EXPANDS OVER LAND, ESPECIALLY ASIA
JUL
MAXIMUM DEVELOPMENT OF 1) PACIFIC AND BERMUDA HIGHS 2) LOW PRESSURE OVER LAND (ESPECIALLY ASIA)
AUG
HIGHS BEGIN TO WEAKEN
SEP
HIGHS CONTINUE TO WEAKENLOWS BEGIN TO WEAKEN OVER NORTHERN OCEANS
OCT
HIGH PRESSURE WEAKENS OVER OCEANSHIGH PRESSURE STARTS TO DEVELOP OVER LANDLOW PRESURE DEVELOPS OVER NORTHERN OCEANS
NOV
LOW PRESSURE EXPANDS OVER NORTHERN OCEANSHIGH PRESURE EXPANDS OVER LAND
DEC
EXTREME AREA OF HIGH PRESSURE OVER ASIA(CENTERED ON SIBERIA, CALLED SIBERIAN HIGH)
SEASONAL CYCLE OF PRESSURE - SEASONAL CYCLE OF PRESSURE - SOUTHERN HEMISPHERESOUTHERN HEMISPHERE
LOOK FOR THE FOLLOWNG• HIGH PRESSURE OVER OCEANS ALL YEAR• CONTINUOUS BAND OF HIGH PRESSURE IN WINTER• HIGH PRESSURE CELLS OVER OCEANS IN SUMMER• LOW PRESSURE OVER LAND IN SUMMER• LESS SEASONAL CHANGE THAN IN NORTHERN HEMI.• HIGH PRESSURE MOST DEVELOPED IN JULY & AUGUST• LOW PRESSURE MOST DEVELOPED DEC TO FEB
HIGH PRESSURE OVER OCEANS ALL YEARCONTINUOUS BAND OF HIGH PRESSURE IN WINTERHIGH PRESSURE CELLS OVER OCEANS IN SUMMERLOW PRESSURE OVER LAND IN SUMMERLESS SEASONAL CHANGE THAN IN NORTHERN HEM.HIGH PRESSURE MOST DEVELOPED IN JULY & AUGLOW PRESSURE MOST DEVELOPED DEC TO FEB
HIGH PRESSURE OVER OCEANS ALL YEARCONTINUOUS BAND OF HIGH PRESSURE IN WINTERHIGH PRESSURE CELLS OVER OCEANS IN SUMMERLOW PRESSURE OVER LAND IN SUMMERLESS SEASONAL CHANGE THAN IN NORTHERN HEM.HIGH PRESSURE MOST DEVELOPED IN JULY & AUGLOW PRESSURE MOST DEVELOPED DEC TO FEB
HIGH PRESSURE OVER OCEANS ALL YEARCONTINUOUS BAND OF HIGH PRESSURE IN WINTERHIGH PRESSURE CELLS OVER OCEANS IN SUMMERLOW PRESSURE OVER LAND IN SUMMERLESS SEASONAL CHANGE THAN IN NORTHERN HEM.HIGH PRESSURE MOST DEVELOPED IN JULY & AUGLOW PRESSURE MOST DEVELOPED DEC TO FEB
HIGH PRESSURE OVER OCEANS ALL YEARCONTINUOUS BAND OF HIGH PRESSURE IN WINTERHIGH PRESSURE CELLS OVER OCEANS IN SUMMERLOW PRESSURE OVER LAND IN SUMMERLESS SEASONAL CHANGE THAN IN NORTHERN HEM.HIGH PRESSURE MOST DEVELOPED IN JULY & AUGLOW PRESSURE MOST DEVELOPED DEC TO FEB
HIGH PRESSURE OVER OCEANS ALL YEARCONTINUOUS BAND OF HIGH PRESSURE IN WINTERHIGH PRESSURE CELLS OVER OCEANS IN SUMMERLOW PRESSURE OVER LAND IN SUMMERLESS SEASONAL CHANGE THAN IN NORTH. HEM.HIGH PRESSURE MOST DEVELOPED IN JULY & AUGLOW PRESSURE MOST DEVELOPED DEC TO FEB
HIGH PRESSURE OVER OCEANS ALL YEARCONTINUOUS BAND OF HIGH PRESSURE IN WINTERHIGH PRESSURE CELLS OVER OCEANS IN SUMMERLOW PRESSURE OVER LAND IN SUMMERLESS SEASONAL CHANGE THAN IN NORTHERN HEM.HIGH PRES. MOST DEVELOPED IN JULY & AUGLOW PRESSURE MOST DEVELOPED DEC TO FEB
HIGH PRESSURE OVER OCEANS ALL YEARCONTINUOUS BAND OF HIGH PRESSURE IN WINTERHIGH PRESSURE CELLS OVER OCEANS IN SUMMERLOW PRESSURE OVER LAND IN SUMMERLESS SEASONAL CHANGE THAN IN NORTHERN HEM.HIGH PRESSURE MOST DEVELOPED IN JULY & AUGLOW PRESSURE MOST DEVELOPED DEC TO FEB