The effect of the meteorological factors on the Alnus pollen season in Lublin (Poland)

Figures & data

Table I. Statistics of the parameters of the Alnus pollen season in Lublin, Poland, 2001–2011 and 2012

	Pollen season			Peak		SPI
Statistics	Start	End	Duration (days)	Value (P/m^3)	Date	(pollen sum)
Mean	67	98	32	1207	79	4841
Minimum	35	77	15	176	58	1090
Maximum	87	120	63	2433	92	8420
Standard deviation	17.9	12.7	15.3	786.4	11.7	2310.9
V (%)	26.5	13.0	48.2	65.1	14.8	47.7
2012	74	88	15	1246	77	4292

Figure 1. Start and end dates of the Alnus pollen season (95% method) in Lublin, Poland, 2001–2011.

Figure 2. Mean temperature in the third ten-day period of January, in February and in March, Lublin 2001–2012.

Figure 3. Similarities in the increase rate of Alnus pollen concentration in the air of Lublin, Poland, 2001–2011.

Figure 4. Scatterplots showing the relationships between season parameters and selected meteorological factors. Lublin, Poland, 2001–2011.

Table II. List of significant Spearman’s correlations between the parameters of the Alnus pollen season in Lublin, Poland, 2001–2011

Parameters of the pollen season	Spearman coefficient
Start and duration	−0.7608
Start and peak date	0.8859
End and peak date	0.7408
Duration and peak value	−0.7790
Duration and SPI	−0.7517
Peak value and SPI	0.8545

Note: Level of significance 0.01.

Table III. Significant Spearman’s correlations between Alnus pollen season parameters and meteorological factors in Lublin, Poland, 2001–2011

Season parameter vs. meteorological factor	Spearman coefficient
Dependent variable: season start
Mean temperature in the first ten-day period of February	−0.745**
Minimum temperature in the first ten-day period of February	−0.727**
Maximum temperature in the first ten-day period of February	−0.818**
Mean temperature in February	−0.800**
Minimum temperature in February	−0.864**
Maximum temperature in February	−0.755**
Mean temperature 30 days before start of the season	−0.661*
Minimum temperature 30 days before start of the season	−0.758**
Humidity 30 days before start of the season	−0.784**
Mean temperature 40 days before start of the season	−0.648*
Minimum temperature 40 days before start of the season	−0.770**
Dependent variable: end
Mean temperature in March	−0.680*
Maximum temperature in March	−0.717*
Rainfall in January	−0.662*
Dependent variable: duration
Mean temperature in the third ten-day period of January	0.733**
Minimum temperature in the third ten-day period of January	0.724*
Mean temperature in the first ten-day period of February	0.624*
Minimum temperature in the first ten-day period of February	0.629*
Minimum temperature in February	0.665*
Mean temperature in the first ten-day period of March	0.770**
Minimum temperature in the first ten-day period of March	0.752**
Maximum temperature in September from previous year	−0.685*
Rainfall in September from previous year	0.752**
Humidity in September from previous year	0.842**
Minimum temperature in October from previous year	0.673*
Dependent variable: peak value
Rainfall in the first ten-day period of January	−0.709*
Minimum temperature in October from previous year	−0.867**
Humidity in September from previous year	−0.745**
Dependent variable: peak date
Mean temperature in the third ten-day period of January	−0.676*
Minimum temperature in the third ten-day period of January	−0.680*
Mean temperature in the first ten-day period of February	−0.785**
Minimum temperature in the first ten-day period of February	−0.763**
Maximum temperature in the first ten-day period of February	−0.822**
Humidity in the second ten-day period of February	0.804**
Mean temperature in February	−0.758**
Minimum temperature in February	−0.721*
Maximum temperature in February	−0.712*
Humidity in February	0.635*
Dependent variable: SPI
Minimum temperature in January	−0.618*
Maximum temperature in September from previous year	0.685*
Minimum temperature in October from previous year	−0.806**
Humidity in September from previous year	−0.782**

Note: Level of significance: *0.05, **0.01.