luquillo czen seminars and disturbance... · 2010. 4. 27. · nf sf ef wf lm ey r 2 = 0.90 rainfall...
TRANSCRIPT
![Page 1: Luquillo CZEN Seminars and Disturbance... · 2010. 4. 27. · NF SF EF WF LM EY r 2 = 0.90 Rainfall (mm/yr) Runoff (mm/yr) Discharge (m3/s) WEIGHTED AVERAGE ELEVATION (m) 200 300](https://reader034.vdocuments.net/reader034/viewer/2022052008/601d69e4daba9741a1749b80/html5/thumbnails/1.jpg)
Luquillo CZEN Seminars• Atmospheric inputs (Spring 2009)
– March 25: Fred Scatena– April 22: Martha Scholl– May 6: Julie Pett-Ridge– June 10: Jamie Shanley
• Bedrock and Soil (Summer 2009)– Brantley, Buss, Wood
• Streams and flow paths (Fall 2009)– McDowell, Honeyfield, Kurtz
• Field Trip/workshop January 2010
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LEF Climate“Consistent but Dynamic”
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ITCZ
Westerlies
Westerlies
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Hadley Cells & TradesBermuda High
Trade wind inversionSummer ~ 1000 m in PR
no barrier for cumulusPresent 45% of time
Winter ~ 500 m cloud barrier for cumuluspresent 85% of time
ITCZ
~ 2400 m in HawaiiCloud Belt ~ 500-1000 m
Upper barrier to TMCF in DR
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Upper & lower limits to Cumulus cloud formation500m to 2000 m
1000 m
~ 500 m ~ lower Cumulus limit
2000 m ~ upper Cumulus limit
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Tropical Storms and Hurricanes
Bermuda High
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Cyclone 11.5% of total
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North Atlantic Oscillation (NAO) index.
12 year period
Luquillo LTERMid 90’s hurricanes
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Mean Total Hourly Radiation, W/m2
2000-2002
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
Wat
ts/m
2
0
200
400
600
800
1000
S S S S S S SS
S
S
S
S S SS
S
S
SS S S S S SB B B B B B B
B
B
B
BB B
BB
B
B
BB B B B B BE E E E E E E
EE
EE
E E EE
EE
EE E E E E E
Mean Hourly Temperature 2000-2002Sabana, Bisley, East Peak
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
Deg
rees
C
18
20
22
24
26
28
30
S S S S S S S
S
S
SS S S S S
SS
S
SS S S S S
B B B B B B BB
BB
B B B B B BB
BB B B B B B
E E E E E E E E E E E E E E E E E E E E E E E E
Diurnal PatternsBisleySabana
East Peak
Radiation
Temperature~ Max daily difference
In afternoonTop and bottom
8C/1000m
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Ground level Open sites 153 m to 1011m5 to 10C difference in afternoon from Top to Bottom
~ 5-6 between adjacent forest and pasturesSabana
Pasture & Forest
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SeaLevel
Land-Sea
Diurnal PatternsAfternoon ~ 5 to 10 degree difference from top to bottom
Sea to land winds complement trade winds
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0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400
mm
/hr
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
Average rainfall per hourAverage 3 showers per day, high interception 35-40%
EP
BIS
SAB (< 40)
Cloud
Carter and Elsner 97
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Benstead et al, 2000
Night-time larval release
Diurnal changes and CZEN processesLand-sea breezes & clouds and rain
Respiration; streams, soils??
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Seasonal Changes
Hurricane formation ~ 26.6
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12/1/2006 4/1/2007 8/1/2007 12/1/2007 4/1/2008 8/1/2008 12/1/2008 21
22
23
24
25
26
27
21 22 23 24 25 26
Daily Average Stream TemperatureBisley 3; 2006-2008
Late SummerPeak
March-AprilLow
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J F M A M J J A S O N D16
18
20
22
24
26
28
30
Mean Daily Air and Stream Water TemperatureBisley Watersheds and East Peak
Max Air
Min Air
Stream
EP Air
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Annual Rainfall and Throughfall“Short Wet and Dry Spells Alternate; Absence of large dry season”
Bisley (3482 mm/yr) and El Verde (3350 mm/yr)
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Annual Calendar of Events & CZEN Processes
African Dust Peak
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Stallard 2001; El Verde NADP Collector
Seasonal Changes in CZEN Processes
Stream Metabolism; Ortiz etal
Ruan et al 2004
Soil Microbial Biomass
Litterfall
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Graniodiorite
Hornfels Peaks
Coastal PlainAlluvium
Volcanoclastics
Changes with Elevation
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Elevation0 100 200 300 400 500 600 700 800 900 1000 1100 1200
mm
/yr
2000
2500
3000
3500
4000
4500
5000 **
EP Rain + Clouds4398+770 = 5168
Mean Annual Rainfall vs elevation
Garcia-Martino et al. 1996Pike 2008
TMCF
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ELEVATION (m)
0 200 400 600 800 1000 1200
RAIN
FALL
(m
m/y
r)
2000
2500
3000
3500
4000
4500
5000
EV
PE
RG
RBU
RBP
RB4
C BGS
NF
SF
EF WF
LMEY
r2 = 0.90
Rainfall (mm/yr) Runoff (mm/yr) Discharge (m3/s)
WEIGHTED AVERAGE ELEVATION (m)
200 300 400 500 600 700 800
RUN
OFF
(m
m/y
r)
1000
1500
2000
2500
3000
3500
4000
RG1ES1
ES2
ES3
RB1
RM1
RM2
RFRS
r2 = 0.77
PREDICTED DISCHARGE (WAE, DA) [m3/s]0.0 0.5 1.0 1.5 2.0 2.5
DIS
CHA
RGE
[m3 /
s]
0.0
0.5
1.0
1.5
2.0
2.5
RG1
ES1
ES2
ES3RB1
RM1
RM2
RF
RS
RG1ES1r2 = 0.97
Wetter, colder, cloudier, windier
Air Temp ~ - 0.59 C/100 m Soil Temp ~ - 0.54 C/100 mRainfall ~ + 235 mm/yr/ 100 mRunoff ~ + 400 mm/yr/ 100 m
Air Soil
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“windward vs leeward” differences within LEFAET/Rainfall
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Elevation and CZEN ProcessesForest Types, NPP, Decomposition & SOM,
Landslides, bioturbation..
SOC
NPP
Earthworms elevation
Cloud Coast
#/m2 Species/m2
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Tradewinds
SynopticSystems
Energy &Moisture
SeaLevel
Land-Sea
Inter-Annual Changes: Local vs Global Drivers
Detailed Records from mid 1980’sForest dynamics from 1940’s
Rainfall and Temp 1900’s
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Median -1.7 mm/yr South slope -2.6 mm/yr (NS)North slope -2.0 mm/yr (NS)
Annual Rainfall20th Century
LEF 88-00
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Rainfall
Throughfall
Relative Nutrient InputsRainfall and Throughfall
Wet & Moist Tropical ForestsStandardized by median
(median = 100)
Cation rich
MaritimeUnpolluted
High interception
Rainfall variation < Throughfall
Rainfall Ca inputs ~ 50 yr landslide AG accumulation
(Heartsil-Scalley et al 207)
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NADP Collector El Verde
Stallard 2001
1984 1998
Marine Cations
Temperate
Desert
Alkalinity
Acid Rain Events
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Cation Flux in Rainfall and Throughfall
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San Juan Daily Temperature
50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 00 02 04 06 08 707172737475767778798081828384858687888990
~ + 0.4 C/DecadeMid 1980’s peak
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Lower Temperature Change within LEFSlight increase in Bisley and El Verde
Possible Decrease in East PeakBisley 93-07
East Peak 02-09
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Tradewinds
SeaLevel
Land-Sea
Larger Temperature Difference from Coastal Plain to PeaksGreater Sea-Land Breezes
Winder and Cooler Cloud Forest???
Van der Molen
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Havana 20th Century Increase
y = -0.0532Ln(x) + 0.1946R2 = 0.12
-0.40
-0.30
-0.20
-0.10
0.00
0.10
0.20
0.30
0.40
1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000
Ann
ual d
evia
tion
from
mea
n ra
infa
ll
PR 20th Century Decrease
Decrease Rainfall & Increase Air TemperatureMostly on Coastal Plain
Relatively Small Changes Overall
Coastal Plain ~ 2.0 mm/yr ~ 500 yrs to change life zones Montane Areas < 0.5 mm/yr ~ 2000 yrsLEF H2O Extraction ~ 190 mm/yr (2 orders of magnitude larger!)
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Luquillo Climatic Disturbances• Droughts & Fires• Hurricanes• Stream channel events• Landslides creating storms
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Canopy Turnover yearsHurricanes (50-60 yrs)
Gaps (165-175 yrs)Bisley Tower after Hugo
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Slope Failures and Tree up roots
Duration more important than IntensityRare with cold frontsUproots
1600 - 4500 yrs
Hurricanes
Slope Failures; 12 degrees, > 300m elevation, East NE slopesCanopy turnover ~ 1300 yrsSoil Steep valleys ~ 500 – 1000 yrsSurface Soil Landscape ~ 3000 + yrs
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Number of Hurricanes passing within 2 degrees of Puerto Rico by decadefrom 1720-2000
1720 1740 1760 1780 1800 1820 1840 1860 1880 1900 1920 1940 1960 1980 2000
Hur
rican
es p
er D
ecad
e
0
2
4
6
8
10
Cum
mul
ativ
e N
umbe
r of H
urric
anes
0
10
20
30
40
50
60
70
Within 2 degrees ~ 4 yrsLocalized damaged ~ 10 - 20 yrsDirect Impact ~ 50 - 60 yrs
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Not only SST or NAO; African Monsoons & ENSO
Donelly & Woodruff 2007
5000 yr record of “Hurricanes” in Vieques
Coral Based SSTLittle Ice AgeLa Parguera
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Daily Rain, mm
mm
/day
0
50
100
150
200
250
Stream flow as % of Undisturbed
01/01/96 03/01/96 05/01/96 07/01/96 09/01/96 11/01/96 01/01/97
% u
ndis
turb
ed
50100150200250300350400450
50% reduction90% reduction
ET as % of Undisturbed
% u
ndis
turb
ed
0
20
40
60
80
100
120
50% reduction 90% reduction
Moisture Storage as % Undisturbed
% u
ndis
turb
ed
98
100
102
104
106
108
110
112
50% reduction90% reduction
Hurricane Defoliation & Hydrologic response daily time series% undisturbed conditions
50% defoliation does not do much!
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The future ??
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Proportion of rainfall that contributed to stream flowDecrease from 1970’s to 1990’s
Influence of reforestationLess H20 to the Coast; extractions & reforestation
Wu etal
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Gonzalez et al 2005
Day time San Juan60C
Nighttime San Juan33C
Increase 0.06 C/yrover adjacent vegetated areas
Getting Hotter !
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Potential Changes in SOM2C increase in Temp, 22% decrease in Precipitation
(~ Late Holocene variation)
Wang et al 2002Increases in areas that will be more productive
Colorado to Tabonuco Forest
< 5 % change
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SOM
HurricaneDominated
110 yr
Gap and slideDominated
40 yr
Saprolite thickness // channel
Stable Ridge Tops – Dynamic valleysLandslide and uproots everywhere
Rapid turnover in top 50-100 cm
Surface
Bedrock
Saprolite
TPI ~ 39%TPI + Age + Depth ~ 60%Vegetation type ~ 8%
Bisley Soils
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Tradewinds
SynopticSystems
Energy &Moisture
SeaLevel
Land-Sea
“Old on the inside -- young on the outside”
1) Local vs distal influences2) Imprint of intense hurricane activity 2000BP