Downscaled Climate Data Projections for Puerto Rico Now Available


The Caribbean Landscape Conservation Cooperative (CLCC) has just announced the release of downscaled climate data projections (through 2099) for Puerto Rico.  This is a valuable resource, which will allow scientists from many fields to evaluate climate change impacts in their respective fields.

The data have the following characteristics:

Projections of daily maximum and minimum temperature and twenty-four hour cumulative precipitation for over 200 long-term weather stations throughout the region for the period 1960-2099 based on Global Climate Models (GCMs) from the Third Coupled Model Intercomparison Project (CMIP3) used for the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (AR4 IPCC).

Projection datasets are available for three greenhouse gas emission scenarios: high (A2), medium (A1B), and low (B1). The global model output for precipitation and temperature were downscaled to local station locations by Hayhoe (2013): 71 stations for precipitation, 29 stations for maximum temperatures (Tmax) and 27 stations for minimum temperatures (Tmin).

Download the downscaled precipitation and temperature data here.  (After loading website, click on Geospatial Data.)

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PRAGWATER now providing daily reference evapotranspiration for St. John, USVI


Daily reference evapotranspiration (ETo) is now available for St. John (USVI) at the following link: Northern Caribbean ETo .  The link also includes ETo data for St. Thomas, St. Croix, Puerto Rico, Hispaniola and Jamaica.

Yesterday’s Reference Evapotranspiration (ETo) for St. John, USVI


The following links will provide guidance on scheduling irrigation using the ETo map data.

Harmsen E.W., 2012.  TECHNICAL NOTE: A Simple Web-Based Method for Scheduling Irrigation in Puerto Rico.  J. Agric. Univ. P.R. 96 (3-4) 2012.

A simple irrigation scheduling tool for using ETo maps

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Challenges of doing research on the UPRM Campus


Recently I initiated a calibration study of two Campbell Scientific weather stations on the University of Puerto Rico-Mayaguez Campus. Calibration of the two stations equipped with older sensors, is being accomplished with a third station with new sensors.

Two weeks ago I took the following photographs which illustrate how the maintenance crew of the university aggressively trim the grass around any and every standing thing, including my research equipment. Their practice is to trim the grass down to the bear soil, and over time cut into the soil itself, thus creating a depression around the trees, telephone poles, sidewalks, etc.  Why do the workers do this?  I guess the reason is because it makes the area look cleaner and also gives them more time before they have to return to trim again.  The down side of this practice is that the soil is exposed to the intense rainfalls, common in Mayaguez, which may lead to soil erosion.

Here are two photos showing excessive trimming around my research equipment. The sensors are sensitive to the ground cover, especially the net radiation sensor.  Consequently the alteration of the site by trimming may compromise the integrity of the data collected by the instruments.  The preferred situation is green grass that is 3 or 4 inches tall.

IMG_5648Figure 1. Excessive trimming around the research equipment.  To prevent further trimming within the area, the red construction tape was put up around the perimeter.

 

IMG_5651Figure 2. Excessive trimming of grass is observable under the center net radiation sensor.

 

Here are some random pictures showing excessive trimming on the UPRM campus.

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IMG_5691This is a groundwater observation well.  Notice that after it rains the depression fills with water.  This water will result in excessive infiltration around the well, possible altering the measured aquifer water level and the water quality.

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When I informed a couple of the worker about my concern, they agreed not to trim inside the perimeter of the area.  But to fulfill their mission, they came back with some type of chemical (Roundup?) and sprayed everything within the perimeter!!!!!!!!  OMG!!!!  Please stop trying to help me!  The two pictures below clearly show the grass dying within the area of the research equipment.  It is possible that within a week there will only be brown dirt within the area, I hope not.

 

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UPDATE: Here is three days after the above pictures were taken.
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Interviews with Real People Impacted by Climate Change


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¿Cómo llega el arroz puertorriqueño a las bandejas de los comedor…


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Largest glacier break-off ever filmed


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Climate Change 2013: A short overview of where we are at.


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PRAGWATER now providing daily reference evapotranspiration for St. Thomas, USVI


Daily reference evapotranspiration (ETo) is now available for St. Thomas (USVI) at the following link: Northern Caribbean ETo.  The link also includes ETo data for Puerto Rico, St. Croix (USVI), Hispaniola and Jamaica.

Yesterday’s Reference Evapotranspiration

St. Thomas, USVI

The following links will provide guidance on scheduling irrigation using the ETo map data.

Harmsen E.W., 2012.  TECHNICAL NOTE: A Simple Web-Based Method for Scheduling Irrigation in Puerto Rico.  J. Agric. Univ. P.R. 96 (3-4) 2012.

A simple irrigation scheduling tool for using ETo maps

Posted in agricultura, agriculture, evapotranspiration, Irrigation, Uncategorized | Tagged , , , , , , , , , , , , , , | Leave a comment

New Micro Irrigation Book


Sustainable Micro Irrigation Design Systems for Field Crops: Practices and Theory

Megh R. Goyal, Mohammad N. Elnesr, Editors

http://www.crcpress.com/product/isbn/9781771880992

9781771880992

I congratulate the editors on the publication of this book on micro irrigation design. Water for food production is clearly one of the grand challenges of the twenty-first century, and it is hoped that this book will help irrigators and famers around the world to increase the adoption of water savings technology such as micro irrigation.”

—Vincent F. Bralts, PhD, PE, Professor and Former Associate Dean, Agricultural and Biological Engineering Department, Purdue University, West Lafayette, Indiana

 

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How hot does it get inside your car?


Recently I said to someone

“I believe the scientific basis of global warming is very simple: if you put more heat (energy) into something than comes out, the temperature will go up. A commonly shared experience we can all relate to is getting into your car on a 90-degree day only to find that the inside temperature is around 120-degrees, due to the trapped heat.”

I wanted to check my statement about the 120 degree Fahrenheit (48.9 degree C) temperature inside the car to see if it was true.  I used a small automated weather station to get the inside and outside air temperatures and an infrared thermometer to measure surface temperatures.  Here is what I found (in degrees C):

12:15 PM, Location Mayaguez, Puerto Rico, Sept. 22, 2014, 2001 Honda Accord, Black.

Air temperature outside 31.6 C

Air temperature inside car 49.1 C (My statement was very close!)

Surface temperatures inside car: Dashboard 88.9 C (192 F  !!!!), driver seat 50C, front floor 39 C, Radio 51.6 C, steering wheel 53 C, trunk floor 56.9 C.

Pavement outside of car 52.1

Grass area near car 33.9

My office chair 17.7 C.  :-)

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