EuroSun2008-13

Materials and Methods

The meteorological and climatic features of Galicia are monitored by a network made up by 93 weather stations, located all over the region covering the usual meteorological parameters. Ten - minute averaged data were collected for both monitoring and climatic studies. The network is managed by MeteoGalicia, the Galician weather service (www. meteogalicia. es). Currently, 25 stations provide the solar radiation measurements with Ph Schenk first class pyranometers (Philipp Schenk GmbH Wien & Co KG, Wien, Austria) and Kipp & Zonen sunshine duration sensors (Kipp & Zonen, Delft, The Netherlands) located in the most representative sites of Galicia. Moreover, 40 silicon cell sensor pyranometres (Skye Instruments LTD, UK), are installed in as many stations. These sensors are periodically cleaned and calibrated by specialized crew, following the manufacturer’s recommendations. Data are collected by dataloggers, sent to a central data server and stored in a database specifically designed for environmental data sets. Here, several filters are applied to ensure the data quality [10, 11].

image059

Fig. 1: Names and locations of the meteorological stations considered in this work, and location of the two pyranometers (at A Coruna and Vigo) used by Vazquez et al. [7].

As a part of the Solar Radiation subject’s programme, each student was required to choose one station between the 65 equipped with pyranometers and to analyse data between September 2006 and August 2007. The main features of these stations are listed on Table 1.

Data proceeding from every selected meteorological station have been processed to obtain monthly-averaged daily values of global irradiation, sunshine duration and clearness index. Measurements of precipitation, temperature and relative humidity have also been processed in order to complete the dataset for analysis.

Table 1: Main features of the meteorological stations applied in the analysis.

Code

Station

Latitude

Longitude

Altitude (m)

Environment

Manufacturer

C1

CIS Ferrol

43.49° N

8.2°

W

34

Suburban, Coastal

Schenk

C2

Sergude

42.82° N

8.46°

W

230

Rural, Inland

N. A.

C3

Rio do Sol

43.1° N

8.69°

W

540

Rural, Inland

Skye

C4

Marco Curra

43.34° N

7.89°

W

649

Rural, Inland

Schenk

C5

EOAS Santiago

42.87° N

8.57°

W

255

Urban, Inland

Schenk

C6

Olas

43.13° N

8.28°

W

401

Rural, Inland

Skye

C7

Serra Faladoira

43.59° N

7.79°

W

576

Rural, Coastal

Skye

C8

Fontecada

42.97° N

8.87°

W

369

Rural, Inland

Schenk

C9

Malpica

43.34° N

8.82°

W

161

Rural, Coastal

Schenk

L1

Courel

42.6° N

7.19°

W

777

Rural, Inland

Skye

L2

Foz

43.56° N

7.28°

W

73

Rural, Inland

Skye

L3

Penedo Galo

43.66° N

7.56°

W

545

Rural, Coastal

Schenk

L4

Burela

43.65° N

7.37°

W

421

Rural, Coastal

Skye

L5

Ancares

42.82° N

6.92°

W

1364

Rural, Inland

Schenk

L6

Boveda

42.65° N

7.47°

W

432

Rural, Inland

Schenk

L7

Pedro Murias

43.54° N

7.08°

W

51

Rural, Coastal

Schenk

L8

Abradelo

42.75° N

7.25°

W

826

Rural, Inland

Skye

L9

Portomarin

41.81° N

7.62°

W

447

Rural, Inland

Skye

P1

Cies

42.22° N

8.9°

W

25

Rural, Coastal

Skye

P10

Queimadelos

42.23° N

8.43°

W

371

Rural, Inland

Schenk

P11

Corrubedo

42.56° N

9.03°

W

30

Rural, Coastal

Schenk

P2

Coron

42.58° N

8.8°

W

14

Rural, Coastal

Schenk

P3

Pereira

42.63° N

8.32°

W

717

Rural, Inland

Skye

P4

Monte Aloia

42.08° N

8.68°

W

484

Rural, Inland

Schenk

P6

Lourizan

42.41° N

О

SO

SO

00

W

57

Urban, Coastal

Schenk

P7

Castro Vicaludo

42° N

8.86°

W

473

Rural, Coastal

Skye

P8

Serra do Faro

42.58° N

7.93°

W

991

Rural, Inland

Skye

P9

Rebordelo

42.47° N

8.5°

W

367

Rural, Inland

N. A.

R1

Baltar

41.95° N

7.71°

W

807

Rural, Inland

Skye

R2

Ourense

42.35° N

7.85°

W

167

Urban, Inland

Skye

R3

Invernadeiro

42.12° N

7.34°

W

1026

Rural, Inland

Schenk

R4

Monte Medo

42.23° N

7.63°

W

608

Rural, Inland

Skye

R5

Amiudal

42.42° N

8.24°

W

553

Rural, Inland

N. A.

R6

Xures

41.9° N

7.9°

W

1059

Rural, Inland

Schenk

Finally, monthly and yearly values of global solar irradiation measured in the meteorological stations have been compared with the results obtained by Vazquez et al. [7].

The clearness index, KT, has been evaluated by the ratio G/G0, where G is the ground measured irradiation and G0 is the extraterrestrial irradiation. For this purpose, a solar constant value of

Подпись: C9 Подпись: C3 image062 Подпись: P3 Подпись: C7, Подпись: -7.5 Подпись: R3 Подпись: I

1376 Wm-2 was adopted, as recommended by Davies [12]. Astronomical relationships were obtained following Iqbal [13].

image068 Подпись: 3100 3000 2900 2800 2700 2600 2500 2400 2300 2200 2100 2000 1900 1800 1700 1600 1500 1400 1300 1200 1100 1000 900 800 700 600 500 image070 Подпись: -9 image072 image073 Подпись: -7.5 Подпись: -7 Подпись: 7 3

Fig. 2: Annual mean values of daily global solar irradiation (kJm-2) distribution over the region. Squares show the locations of the stations selected by the students and applied in this analysis.

image077image078Fig. 3: Annual values of (a) precipitation (mm) and (b) mean relative humidity (%) over the region.

Data for every station were collected, joined together and interpolated using Kriging technique, in order to get appropriate maps for analysis. Software package SURFER (http://www. ssg- surfer. com/) provided graphical representation of these results.

2. Results

EuroSun2008-13

Benchmarking

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Analysed databases and integrated systems

Each of the databases analysed here is integrated within a system (software setup) that provides additional tools for search, query, maps display, and calculation of derived parameters. PVGIS (the European …

Linke’s Turbidity Factor Applied to Worldwide Global. Horizontal Irradiance Measurements

Frank Bason SolData Instruments, Linabakken 13, DK-8600 Silkeborg, DenmarkCorresponding Author, soldata@soldata. dk Abstract The data collection phase of the Danish Galathea III Expedition was conducted from August 2006 until April …

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