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Evaluation of corrective measures implemented for the preventive conservation of fresco paintings in Ariadne's house (Pompeii, Italy).

Merello P, García-Diego FJ, Zarzo M - Chem Cent J (2013)

Bottom Line: Data recorded in 2008 and 2010 were compared.As a result, the daily thermohygrometric variations resulted less pronounced in 2010, with a reduction of approximately 4°C, which is favorable for the preservation of mural paintings.In the room with four walls, the daily fluctuations also decreased about 4°C.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Applied Physics (UD Agriculture Engineering), Universitat Politècnica de València, Camino de Vera s/n, Valencia, 46022, Spain. fjgarcid@upvnet.upv.es.

ABSTRACT

Background: A microclimate monitoring study was conducted in 2008 aimed at assessing the conservation risks affecting the valuable wall paintings decorating Ariadne's House (Pompeii, Italy). It was found that thermohygrometric conditions were very unfavorable for the conservation of frescoes. As a result, it was decided to implement corrective measures, and the transparent polycarbonate sheets covering three rooms (one of them delimited by four walls and the others composed of three walls) were replaced by opaque roofs. In order to examine the effectiveness of this measure, the same monitoring system comprised by 26 thermohygrometric probes was installed again in summer 2010. Data recorded in 2008 and 2010 were compared.

Results: Microclimate conditions were also monitored in a control room with the same roof in both years. The average temperature in this room was lower in 2010, and it was decided to consider a time frame of 18 summer days with the same mean temperature in both years. In the rooms with three walls, the statistical analysis revealed that the diurnal maximum temperature decreased about 3.5°C due to the roof change, and the minimum temperature increased 0.5°C. As a result, the daily thermohygrometric variations resulted less pronounced in 2010, with a reduction of approximately 4°C, which is favorable for the preservation of mural paintings. In the room with four walls, the daily fluctuations also decreased about 4°C. Based on the results, other alternative actions are discussed aimed at improving the conservation conditions of wall paintings.

Conclusions: The roof change has reduced the most unfavorable thermohygrometric conditions affecting the mural paintings, but additional actions should be adopted for a long term preservation of Pompeian frescoes.

No MeSH data available.


Related in: MedlinePlus

Average temperature in summer 2008 and 2010 recorded by data-loggers #3 and #4 (room 4). Day 0 corresponds to July 20th 2008 (dashed trajectory) and July 20th 2010 (continuous). A moving average with a window size of 48 data (i.e., one day) was applied to smooth both time series. The time frame from day 25 to 42 (highlighted in gray color) presents a similar average temperature in both years.
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Figure 2: Average temperature in summer 2008 and 2010 recorded by data-loggers #3 and #4 (room 4). Day 0 corresponds to July 20th 2008 (dashed trajectory) and July 20th 2010 (continuous). A moving average with a window size of 48 data (i.e., one day) was applied to smooth both time series. The time frame from day 25 to 42 (highlighted in gray color) presents a similar average temperature in both years.

Mentions: Data recorded in 2008 and 2010 can only be directly compared in the case of similar thermohygrometric conditions outside the rooms. Meteorological data from a weather station in Pompeii would be necessary to check this issue. Unfortunately, the closest stations are located in Naples and Capri, too far away. Given that room 4 was the only one that maintained the same roof, probes located there (#3 and #4) can be used as a reference to compare ambient conditions in both years. Figure 2 shows the average trajectories of temperature in room 4 for the monitored period of 58 days. In this period, the mean temperature was 27.8°C in 2008 and 26.2°C in 2010. The fact that summer 2008 was hotter may lead to a misinterpretation of data from probes in rooms 1–3. Thus, it is not possible to conclude if the observed differences of temperature in rooms 1–3 are caused by the roof change or are due to the different outside temperatures of each year, which implies that both effects are confounded.


Evaluation of corrective measures implemented for the preventive conservation of fresco paintings in Ariadne's house (Pompeii, Italy).

Merello P, García-Diego FJ, Zarzo M - Chem Cent J (2013)

Average temperature in summer 2008 and 2010 recorded by data-loggers #3 and #4 (room 4). Day 0 corresponds to July 20th 2008 (dashed trajectory) and July 20th 2010 (continuous). A moving average with a window size of 48 data (i.e., one day) was applied to smooth both time series. The time frame from day 25 to 42 (highlighted in gray color) presents a similar average temperature in both years.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3672094&req=5

Figure 2: Average temperature in summer 2008 and 2010 recorded by data-loggers #3 and #4 (room 4). Day 0 corresponds to July 20th 2008 (dashed trajectory) and July 20th 2010 (continuous). A moving average with a window size of 48 data (i.e., one day) was applied to smooth both time series. The time frame from day 25 to 42 (highlighted in gray color) presents a similar average temperature in both years.
Mentions: Data recorded in 2008 and 2010 can only be directly compared in the case of similar thermohygrometric conditions outside the rooms. Meteorological data from a weather station in Pompeii would be necessary to check this issue. Unfortunately, the closest stations are located in Naples and Capri, too far away. Given that room 4 was the only one that maintained the same roof, probes located there (#3 and #4) can be used as a reference to compare ambient conditions in both years. Figure 2 shows the average trajectories of temperature in room 4 for the monitored period of 58 days. In this period, the mean temperature was 27.8°C in 2008 and 26.2°C in 2010. The fact that summer 2008 was hotter may lead to a misinterpretation of data from probes in rooms 1–3. Thus, it is not possible to conclude if the observed differences of temperature in rooms 1–3 are caused by the roof change or are due to the different outside temperatures of each year, which implies that both effects are confounded.

Bottom Line: Data recorded in 2008 and 2010 were compared.As a result, the daily thermohygrometric variations resulted less pronounced in 2010, with a reduction of approximately 4°C, which is favorable for the preservation of mural paintings.In the room with four walls, the daily fluctuations also decreased about 4°C.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Applied Physics (UD Agriculture Engineering), Universitat Politècnica de València, Camino de Vera s/n, Valencia, 46022, Spain. fjgarcid@upvnet.upv.es.

ABSTRACT

Background: A microclimate monitoring study was conducted in 2008 aimed at assessing the conservation risks affecting the valuable wall paintings decorating Ariadne's House (Pompeii, Italy). It was found that thermohygrometric conditions were very unfavorable for the conservation of frescoes. As a result, it was decided to implement corrective measures, and the transparent polycarbonate sheets covering three rooms (one of them delimited by four walls and the others composed of three walls) were replaced by opaque roofs. In order to examine the effectiveness of this measure, the same monitoring system comprised by 26 thermohygrometric probes was installed again in summer 2010. Data recorded in 2008 and 2010 were compared.

Results: Microclimate conditions were also monitored in a control room with the same roof in both years. The average temperature in this room was lower in 2010, and it was decided to consider a time frame of 18 summer days with the same mean temperature in both years. In the rooms with three walls, the statistical analysis revealed that the diurnal maximum temperature decreased about 3.5°C due to the roof change, and the minimum temperature increased 0.5°C. As a result, the daily thermohygrometric variations resulted less pronounced in 2010, with a reduction of approximately 4°C, which is favorable for the preservation of mural paintings. In the room with four walls, the daily fluctuations also decreased about 4°C. Based on the results, other alternative actions are discussed aimed at improving the conservation conditions of wall paintings.

Conclusions: The roof change has reduced the most unfavorable thermohygrometric conditions affecting the mural paintings, but additional actions should be adopted for a long term preservation of Pompeian frescoes.

No MeSH data available.


Related in: MedlinePlus