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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

Bivariate plot of daily maximum (Tmax) and minimum (Tmin) temperatures in 2010 vs. 2008. Bivariate plot of Tmax (a) and Tmin (b) recorded from each probe in 2010 vs. 2008 (monitoring period: 14th to 31st of August). The tilted line is the bisector.
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Figure 9: Bivariate plot of daily maximum (Tmax) and minimum (Tmin) temperatures in 2010 vs. 2008. Bivariate plot of Tmax (a) and Tmin (b) recorded from each probe in 2010 vs. 2008 (monitoring period: 14th to 31st of August). The tilted line is the bisector.

Mentions: Figure 9a displays a scatterplot of Tmax in 2010 vs. Tmax in 2008. Probes #3 and #4 appear on the bisector line (i.e., equal mean values in both years), which indicates that the 18-day period was correctly selected. Some additional probes are also close to the bisector, but most of them yielded a lower Tmax in 2010 as discussed above. The high Tmax of #9, #10 or #21 is also reflected in Figure 7, but Figure 9a provides complementary information because all probes are depicted. The bivariate plot of Tmin in 2010 vs. Tmin in 2008 (Figure 9b) is consistent with Figure 8 and reveals that Tmin was about 0.6°C higher in 2010 on average compared with 2008, except in the case of room 2 with 0.3°C of variation.


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)

Bivariate plot of daily maximum (Tmax) and minimum (Tmin) temperatures in 2010 vs. 2008. Bivariate plot of Tmax (a) and Tmin (b) recorded from each probe in 2010 vs. 2008 (monitoring period: 14th to 31st of August). The tilted line is the bisector.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 9: Bivariate plot of daily maximum (Tmax) and minimum (Tmin) temperatures in 2010 vs. 2008. Bivariate plot of Tmax (a) and Tmin (b) recorded from each probe in 2010 vs. 2008 (monitoring period: 14th to 31st of August). The tilted line is the bisector.
Mentions: Figure 9a displays a scatterplot of Tmax in 2010 vs. Tmax in 2008. Probes #3 and #4 appear on the bisector line (i.e., equal mean values in both years), which indicates that the 18-day period was correctly selected. Some additional probes are also close to the bisector, but most of them yielded a lower Tmax in 2010 as discussed above. The high Tmax of #9, #10 or #21 is also reflected in Figure 7, but Figure 9a provides complementary information because all probes are depicted. The bivariate plot of Tmin in 2010 vs. Tmin in 2008 (Figure 9b) is consistent with Figure 8 and reveals that Tmin was about 0.6°C higher in 2010 on average compared with 2008, except in the case of room 2 with 0.3°C of variation.

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