Uncertainty of Climate Change and Synoptic Parametersand modeling the trends

Climate changes is a natural phenomenon which have long-term sequenceoccurrence and return period. impact of human activities may aggravate theeffects of climate change in ecosystems, intensity of climate change trend andintervals between changes. climate change can be reviewed using synopticalparameters as their indicators.in this study, based on average annualprecipitation trend, temperature and relative humidity using de martonneindex were estimated for the recent 20-year period in mazandaran province,iran. mathematical modeling of these changes and trends was conductedusing regression models and curve expert software. results showedmeaningful changes in temperature and relative humidity during the selectedperiod. the amount of precipitation did not show a significant trend, but aincrease at the end of the period as compared with the beginning. there arealso relative changes in de martonne index during recent two decades, but nosignificant sign of climate change was spotted for this region.