ClimateParams.h

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/*!
 * \file ClimateParams.h
 * \brief Functions for climate related intermediate parameters,
 *          e.g., saturation vapor pressure, max solar radiation.
 * \author LiangJun Zhu
 * \date April 2016
 *
 */
#ifndef SEIMS_CLIMATE_PARAMS_H
#define SEIMS_CLIMATE_PARAMS_H
 
#include <ctime>
#include "seims.h"
 
using std::time_t;
 
/*!
 * \defgroup ClimateParameters
 * \ingroup common_algorithm
 * \brief Functions for climate related intermediate parameters.
 */
 
/*!
 * \ingroup ClimateParameters
 * \brief Calculate latent heat of vaporization(MJ/kg)
 * \param[in] tmean Mean temperature
 * \return Latent heat of vaporization
 */
FLTPT LatentHeatVapor(FLTPT tmean);
 
/*!
 * \ingroup ClimateParameters
 * \brief Calculate the max solar radiation for a station of one day
 * \param[in] day Julian day
 * \param[in] lat Latitude (degree) of the station
 * \param[out] day_l day length (hr)
 * \param[out] max_sr The max solar radiation
 */
void MaxSolarRadiation(int day, FLTPT lat, FLTPT& day_l, FLTPT& max_sr);
 
/*!
 * \ingroup ClimateParameters
 * \brief Calculate mean barometric pressure
 * \param[in] elev elevation of current cell or site
 * \return mean atmospheric pressure (kPa)
 */
FLTPT MeanBarometricPressure(FLTPT elev);
 
/*!
 * \ingroup ClimateParameters
 * \brief Calculate psychrometric constant
 * \param[in] elev elevation of current cell or site
 * \param[in] tmean Mean temperature
 * \sa MeanBarometricPressure()
 * \sa LatentHeatVapor()
 * \return Psychrometric constant
 */
FLTPT PsychrometricConst(FLTPT tmean, FLTPT elev);
 
/*!
 * \ingroup ClimateParameters
 * \brief Calculates saturation vapor pressure at a given air temperature.
 * \param[in] mean_tmp Mean air temperature(deg C)
 * \return saturation vapor pressure(kPa)
*/
FLTPT SaturationVaporPressure(FLTPT mean_tmp);
 
#endif /* SEIMS_CLIMATE_PARAMS_H */