Detailed Description

ILWR clear sky parametrization.

Using air temperature (TA) and relative humidity (RH), this offers the choice of several clear sky parametrizations with the following arguments:

TYPE: specify the parametrization that should be used, any of the following:
- BRUTSAERT – from Brutsaert, "On a Derivable Formula for Long-Wave Radiation From Clear Skies", Journal of Water Resources Research, 11, No. 5, October 1975, pp 742-744.
- DILLEY – from Dilley and O'Brien, "Estimating downward clear sky long-wave irradiance at the surface from screen temperature and precipitable water", Q. J. R. Meteorolo. Soc., 124, 1998, pp 1391-1401.
- PRATA – from Prata, "A new long-wave formula for estimating downward clear-sky radiation at the surface", Q. J. R. Meteorolo. Soc., 122, 1996, pp 1127-1151.
- CLARK – from Clark & Allen, "The estimation of atmospheric radiation for clear and cloudy skies", Proceedings of the second national passive solar conference, 2, 1978, p 676.
- TANG – from Tang et al., "Estimates of clear night sky emissivity in the Negev Highlands, Israel", Energy Conversion and Management, 45.11, 2004, pp 1831-1843.
- IDSO – from Idso, "A set of equations for full spectrum and 8 to 14 um and 10.5 to 12.5 um thermal radiation from cloudless skies", Water Resources Research, 17, 1981, pp 295-304.

Please keep in mind that for energy balance modeling, this significantly underestimate the ILWR input.

[Generators]
ILWR::generator1 = clearsky_LW
ILWR::arg1::type = Dilley

The graph below shows the comparison between measured and modeled ILWR depending on the chosen parametrization. The measured data (ISWR, TA, RH and the reference ILWR) comes from the Weissfluhjoch *WFJ AWS (2691m, Davos, Switzerland) for the 2010-08-01 – 2019-08-01 period with half-hourly resolution. The data has been binned every 5 W/m², the black dots represent the average of the bin, the greay area contains every data point (ie it shows the minimum and maximum data) while the brown area is defined as average±σ.

Comparison between measured and parametrized ILWR at the Weissfluhjoch *WFJ station (2691m, Davos, Switzerland) for the 2010-08-01 – 2019-08-01 period

#include <ClearSkyLWGenerator.h>

Public Member Functions
	ClearSkyLWGenerator (const std::vector< std::pair< std::string, std::string > > &vecArgs, const std::string &i_algo, const std::string &i_section, const double &TZ)

bool	generate (const size_t &param, MeteoData &md, const std::vector< MeteoData > &vecMeteo)

bool	create (const size_t &param, const size_t &ii_min, const size_t &ii_max, std::vector< MeteoData > &vecMeteo)
	Fill one time series of MeteoData for one station. More...

Public Member Functions inherited from mio::GeneratorAlgorithm
virtual	~GeneratorAlgorithm ()

virtual bool	generate (const size_t &param, MeteoData &md, const std::vector< MeteoData > &vecMeteo)=0

virtual bool	create (const size_t &param, const size_t &ii_min, const size_t &ii_max, std::vector< MeteoData > &vecMeteo)=0
	Fill one time series of MeteoData for one station. More...

bool	skipStation (const std::string &station_id) const
	Should this station be skipped, based on user-provided station ID restrictions? More...

bool	skipTimeStep (const Date &dt) const
	Should this timestep be skipped, based on user-provided time restrictions? More...

std::vector< DateRange >	getTimeRestrictions () const

std::string	getAlgo () const

Additional Inherited Members
Protected Member Functions inherited from mio::GeneratorAlgorithm
	GeneratorAlgorithm (const std::vector< std::pair< std::string, std::string > > &vecArgs, const std::string &i_algo, const std::string &i_section, const double &TZ)
	protected constructor only to be called by children More...

virtual void	parse_args (const std::vector< std::pair< std::string, std::string > > &)

Static Protected Member Functions inherited from mio::GeneratorAlgorithm
static std::set< std::string >	initStationSet (const std::vector< std::pair< std::string, std::string > > &vecArgs, const std::string &keyword)

Protected Attributes inherited from mio::GeneratorAlgorithm
const std::vector< DateRange >	time_restrictions

const std::set< std::string >	excluded_stations

const std::set< std::string >	kept_stations

const std::string	algo

const std::string	section

Static Protected Attributes inherited from mio::GeneratorAlgorithm
static const double	soil_albedo = .23

static const double	snow_albedo = .85

static const double	snow_thresh = .1

Constructor & Destructor Documentation

◆ ClearSkyLWGenerator()

mio::ClearSkyLWGenerator::ClearSkyLWGenerator	(	const std::vector< std::pair< std::string, std::string > > &	vecArgs,
		const std::string &	i_algo,
		const std::string &	i_section,
		const double &	TZ
	)

inline

Member Function Documentation

◆ create()

bool mio::ClearSkyLWGenerator::create	(	const size_t &	param,
		const size_t &	ii_min,
		const size_t &	ii_max,
		std::vector< MeteoData > &	vecMeteo
	)

virtual

Fill one time series of MeteoData for one station.

This is used by the dataCreators to create a new parameter in one go for the whole timeseries.

Parameters

[in]	param	meteo parameter to generate
[in]	ii_min	minimum index to apply it to in vecMeteo
[in]	ii_max	maximum index to apply it to in vecMeteo
[in]	vecMeteo	meteo timeseries to process

Returns: true if all missing data points for the given parameter could be generated, false otherwise

Implements mio::GeneratorAlgorithm.

◆ generate()

bool mio::ClearSkyLWGenerator::generate	(	const size_t &	param,
		MeteoData &	md,
		const std::vector< MeteoData > &	vecMeteo
	)