Solar activity cloudiness effect on NH warming for 1980–2095

Mendoza, V. M.; Mendoza, B.; Garduño, René; Villanueva, E. E.; Adem, Julián

doi:10.1016/j.asr.2015.11.024

Cited by 5 publications

(6 citation statements)

References 49 publications

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“…On the NH troposphere, Adem 18 found that the vertical average ( of is linearly correlated to , and that the deviation is a quadratic function of the vertical coordinate , this quadratic function is also verified in Mendoza et al 20 with annual and hemispheric average data at various levels, obtained from the NCEP/NCAR Reanalysis ( http://www.esrl.noaa.gov/psd/data/timeseries/ ). The adjustment coefficients of depend on the latitude and the season (Table 1 in Adem 18 ).…”

Section: First Parameterizationsupporting

confidence: 55%

“…For the case in which is conserved (at every level) with a change of temperature, the exponent in Eq. ( 20 ) is higher and its value is (Mendoza et al 20 ).…”

Section: Second Parameterizationmentioning

confidence: 98%

“…Mendoza et al 20 found for the NH that in annual and hemispheric average, decreases as the temperature increases in the troposphere; for example, at 850 mb, where is ~ 63.9%, an increase of 1 °C is associated with 3 pp decrease in , while on the surface, where is ~ 78.3%, the decrease is only 0.73 pp. Using this condition, Mendoza et al 20 determine that the precipitable water in the troposphere can be expressed as: where is the typical (annual and global, long-term average) of . The value of in the exponent of Eq.…”

Section: Second Parameterizationmentioning

confidence: 99%

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Thermodynamics of climate change between cloud cover, atmospheric temperature and humidity

Mendoza

Pazos

Garduño

et al. 2021

Sci Rep

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On a global and annual average, we find a parameterization in which the cloud cover increase is proportional to the mid tropospheric temperature increase, with a negative proportionality factor. If the relative humidity is conserved throughout the troposphere, a 1 °C heating (cooling) of the mid troposphere, decreases (increases) the cloud cover by 1.5 percentage points (pp). But if the relative humidity is not conserved, then the cloud cover decreases (increases) by 7.6 pp. If the shortwave reflection effect of the cloud cover is dominant on a global scale, this parameterization leads to a predominant positive feedback: if the temperature increases like in the current climate change, the cloud cover decreases and more solar radiation reaches the surface increasing the temperature even more. The contribution of the present work consists in finding that the negative sign of the proportionality factor is due to the Clausius–Clapeyron equation; that is, to the magnitude of the derivative of the saturation vapor pressure at the typical standard surface temperature of 288 K. The negative sign of the factor is independent on the conservation or non-conservation of relative humidity in the troposphere under climate change.

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Section: First Parameterizationsupporting

confidence: 55%

“…For the case in which is conserved (at every level) with a change of temperature, the exponent in Eq. ( 20 ) is higher and its value is (Mendoza et al 20 ).…”

Section: Second Parameterizationmentioning

confidence: 98%

Section: Second Parameterizationmentioning

confidence: 99%

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Thermodynamics of climate change between cloud cover, atmospheric temperature and humidity

Mendoza

Pazos

Garduño

et al. 2021

Sci Rep

Self Cite

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“…The model also includes a cloud cover, whose horizontal extent is a function of the tropospheric temperature at the 700 mb level (~3.0 km of altitude). This cloud cover is the superposition of low and middle clouds relevant to the climate [25]. It also includes the cryosphere over oceans and continents, with a layer of permanent ice and a seasonal snow-ice layer.…”

Section: The Modelmentioning

confidence: 99%

“…The model has three sets of feedback due to the respective water phases: vapor (gas), clouds (liquid) and cryosphere (solid). The first feedback is described in [25] and the second and third ones are presented hereafter.…”

Section: The Modelmentioning

confidence: 99%

Modelling the Present Global Terrestrial Climatic Response Due to a Chicxulub-Type Asteroid Impact

Mendoza

Garduño

et al. 2020

Atmosphere

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A Chicxulub-like asteroid event occurs, on average, approximately every ~27 to 200 million years. Therefore, such an event could happen presently. Here, we simulate the climatic anomalies it may cause with respect to the current conditions, assuming the same target geology of carbonates and evaporates and a 1 Gt release of sulphate gases. We used a thermodynamic model, including water vapor, cloudiness (by greenhouse and albedo effects), and cryosphere feedback to calculate aerosol cooling. We found that it took nearly 4.5 years for solar radiation to recover its preimpact value—during the first year practically no solar radiation reached the surface. Recovery of the temperature took more than 45 years. The lowest temperatures occurred between 1.5 and 5 years after the impact, being the coldest at −14 °C below the preimpact temperature. July surface temperature anomalies occurred 1.5 years after the impact, becoming one of the largest, compared to preimpact temperatures. Most continents showed temperature anomalies of −45 °C. The least cold places were the polar regions with temperature anomalies between approximately −5 and 0 °C. As for the most remarkable climatic effect, we found that, for ~6 years, the ice extended over almost all the ocean surface and, after ~25 years, it covered nearly half of the surface, remaining so for beyond 45 years. The continental ice remained without reduction beyond 45 years. Sixty years after the impact, the surface oceanic and continental fractions covered by ice were 0.52 and 0.98, respectively. We also modeled the effect of smaller quantities of sulfur released after asteroid impacts, concluding that an instantaneous, large climatic perturbation attributed to a loading range may lead to a semi-permanent shift in the climate system.

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Solar signal on regional scale: A study of possible solar impact upon Romania's climate

Sfîcă

Iordache

Voiculescu

2018

Journal of Atmospheric and Solar-Terrestrial Physics

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Solar activity cloudiness effect on NH warming for 1980–2095

Cited by 5 publications

References 49 publications

Thermodynamics of climate change between cloud cover, atmospheric temperature and humidity

Thermodynamics of climate change between cloud cover, atmospheric temperature and humidity

Modelling the Present Global Terrestrial Climatic Response Due to a Chicxulub-Type Asteroid Impact

Solar signal on regional scale: A study of possible solar impact upon Romania's climate

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