jueves, 6 de diciembre de 2012

Climate Controls

What affects the climate of Liberia, Costa Rica


 Meso- Scale



Orographic barrier: Liberia is located in the west of the Guanacaste Cordillera, situated on the leeward side as a result of dry, warm climate from January to April.






  
 SOURCE 

   

  • Intertropical Convergence Zone (ITCZ) affects the weather of Liberia when it migrates north or south. When the ITCZ belt starts moving northward, Costa Rica enters its rainy season and moist air starts entering land from the South Pacific Ocean and the Carribean Sea, convecting air and causing rain.


  • Atmospheric Circulation Patterns: Hurricanes rarely hit Costa Rica; when there is a hurricane on the Caribbean Sea, it produces moisture that brings rain to Costa Rica.
                                                                         Micro- Scale

    When the North-easterly winds blow from the Carribean sea towards the Guanacaste Cordillera, all the rain stays on the east side of the cordillera. The air is forced to rise by the orographic barrier, descending on Liberia, creating an arid climate with no precipitation.












  


  • Vegetation: During the period of arid climate, vegetation is affected. With many days of drought, plants have adapted to lack of water, surviving by losing their leaves. Antropogenic alterations also affects the native vegetation to farm non-navite species plants or raise cattle.










 Liberia & Costa Rica: Mean Temperature

The data provided in the graph was taken from National Climatic Data Center. In the graph, 26 years of data shows the mean temperatures of January and July of every year.



Data from 1993 and 1998 was not documented due to missing information.

The consistent lowest mean temperature has remained the same for 25 years between 20-25°C with slightly lower temperature. For example, in Januanry 1992, it was 18.4°C .

Also, the maximum mean temperature has remained the same between 30-35°C, and has decreased below normal once in July 1996 with 27.9°C .

During the dry season, temperatures increase and decrease more in comparisone to wet season.

Barcelona, Spain compare to Liberia, Costa Rica









SOURCE                                                                                                     SOURCE


Barcelona, Spain is located 41.4 N and 2.2 E in Europe in the Iberian penunsula on the Mediterranean sea. Liberia, Costa Rica is located 10.6 N, 85.4 W in  Central America between the South Pacific Ocean and Carribean Sea.

Even though these two locations are found at different latitudes and longitudes, Barcelona is also affected by the ITCZ. The maximum and minimum temperatures are lower in Barcelona than in Liberia due to the location and air masses that affect the climate such as the cT and mP. The temperautes in Barcelona have a greater variety between lows and highs. Barcelona is a more developed country with more buildings, dealing with a micro-scale climate control, a Heat Island Effect, and is really close to a large body of water, creating a humid climate. Costa Rica is a less developed country with more vegetation spaces surrounded by water.








 


 

Sources

viernes, 16 de noviembre de 2012

Climate

Liberia's climate is influenced by large bodies of air with homogoneous properties of temperature and moisture known as air masses. The air mass found in Liberia is maritime Tropical (mT) with warm and humid climate all year round and unstable air.




Unstable air rises because is warmer and less dense than the surrounding air producing clouds, rain or thunderstorms.



According to Koeppen-Geiger Climate Classification Scale

 Liberia has a climate of Af- Tropical Wet Rainforest
A: Tropical Humid at low latitudes; warm and wet f: wet all year
This scale does not take in consideration cloud coverage, winds or sunshine.

SOURCE




Intertropical Convergence Zone (ITCZ)

Near the equator a belt of precipitation known as the Intertropical convergence zone or the equatorial low affects the climate of Liberia, Costa Rica.  ITCZ is a belt of low pressure that drives the Hadley Cells where ascending moisture, hot air and precipitation is found. This belt moves poleward or equator-ward base on season depending on the amount of solar energy. The maximum amount of solar energy causes the ITCZ to be stronger.






Seasons

Rainy Season: Winter (May-November)
During May the ITCZ gets close to Costa Rica, marking the start of raining season. Between July and August the ITCZ moves to the north causing some weeks of dry weather.

Dry Season: Summer (December- April)
During December the ITCZ start to move south marking the start of dry season.

Trade Winds

North-easterly trade winds flow towards the ITCZ deflected to the right on the northern hemisphere due to the Coriolis effect. North-easterly trade winds affect the amount of precipitation where air converges from April to October blown from the Caribbean.





Hadley Cell



Warm moist air rises, cooling and  forming cumulus clouds causing precipitation as rain or thunderstorms. Warm air has a greater saturation quantity to hold more vapor water than cold air. When the air rises and cools the water vapor has to be release due to amount of water cold air can hold releasing the water vapor as precipitation.



Orographic Lifting
Liberia is in the lowlands of the Guanacaste Cordillera, when air comes from the North-easterly trade winds the air is force to rise on the wet windward side and descend in the leeward side that is Liberia causing a dry climate.






martes, 23 de octubre de 2012

Liberia, Costa Rica

Liberia, Costa Rica is located 10.63N and 85.43 W near the coast of the Pacific Ocean. The climate is tropical due to its location near the equator receiving 12 hours of sunlight.SOURCE
 
Costa Rica is divided into major cities, Liberia is part of the major City Guanacaste.

Elevation (meters)

Costa Rica has a diversity of weather due to the various elevations, at higher elevations the temperatures are colder and low precipitation. Liberia is position in the lowlands of the Guanacaste Cordillera away from the coast having a dry arid season.

Average Monthly Temperatures
SOURCE
 
Costa Rica has two main seasons; tropical and subtropical season.
  • Tropical: Rainy Season (May-November)
  • Sub-tropical: Dry Season (December-April)
Seasons are determine by the north-easterly trade winds. On dry season the trade winds carry moisture to the mountains creating the cloud forest.

Average Annual Precipitation

 
 In this diagram it can be seen the dry season is from December to mid- April, raining once or twice per month. The rainy season it's from mid-April to November, the most rainy months are September and October.

Convergence
 
 
Cold air moving from the ocean to land uplifts the air. Land gets heated and cooled faster than a body of water. During the day the land starts heating also rising the air temperatures causing low pressure, sea breeze cold air with high pressure starts blowing to the land. High pressure always moves to low pressure also taking in consideration cold air is denser than warm air. Cold air blown into the land uplifts the warm air causing a cumulous cloud to form and brings precipitation.

Maritime Tropical air masses causes the weather of Costa Rica to be warm and humid most of the year having an ustable atmosphere. Moisture is present in the air as a result higher amounts of latent heat are found, having a low Bowen ration.

Clouds

Clouds can be found more often when there is more water in the atmospher during the rainy season.



 Potential for Severe Weather     
 

During the rainy season, lowlands are more prone to flooding and landslides.









During the most rainy seasons September and October, storms occur more often followed by high speed winds.











Sources
http://geography.about.com/library/cia/blccostarica.htm
http://www.hola.cr/en/costa-rica-info/geography-climate.html
 http://www.guanacastecostarica.com/climate.html
 http://www.worldheadquarters.com/cr/climate/
 http://weatherspark.com/averages/32642/Liberia-Guanacaste-Costa-Rica